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136243031 = 1039131129
BaseRepresentation
bin10000001111011…
…10011101010111
3100111100212022012
420013232131113
5234334234111
621304054435
73243022001
oct1007563527
9314325265
10136243031
116a9a6451
123976441b
13222c32a2
1414147371
15be6348b
hex81ee757

136243031 has 4 divisors (see below), whose sum is σ = 136375200. Its totient is φ = 136110864.

The previous prime is 136243021. The next prime is 136243043. The reversal of 136243031 is 130342631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130342631 = 314204601.

It is a cyclic number.

It is not a de Polignac number, because 136243031 - 214 = 136226647 is a prime.

It is a super-2 number, since 2×1362430312 = 37124326992133922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136242988 and 136243006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136243021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64526 + ... + 66603.

It is an arithmetic number, because the mean of its divisors is an integer number (34093800).

Almost surely, 2136243031 is an apocalyptic number.

136243031 is a deficient number, since it is larger than the sum of its proper divisors (132169).

136243031 is a wasteful number, since it uses less digits than its factorization.

136243031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132168.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 136243031 is about 11672.3190069497. The cubic root of 136243031 is about 514.5624599327.

Adding to 136243031 its reverse (130342631), we get a palindrome (266585662).

The spelling of 136243031 in words is "one hundred thirty-six million, two hundred forty-three thousand, thirty-one".

Divisors: 1 1039 131129 136243031