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131012123 = 1111910193
BaseRepresentation
bin1111100111100…
…01011000011011
3100010112002211212
413303301120123
5232014341443
621000013335
73150404354
oct763613033
9303462755
10131012123
1167a53390
1237a6124b
13211b1388
1413584d2b
15b77d618
hex7cf161b

131012123 has 4 divisors (see below), whose sum is σ = 142922328. Its totient is φ = 119101920.

The previous prime is 131012113. The next prime is 131012173. The reversal of 131012123 is 321210131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321210131 = 1129200921.

It is a cyclic number.

It is not a de Polignac number, because 131012123 - 212 = 131008027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131012098 and 131012107.

It is not an unprimeable number, because it can be changed into a prime (131012113) 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, 5955086 + ... + 5955107.

It is an arithmetic number, because the mean of its divisors is an integer number (35730582).

Almost surely, 2131012123 is an apocalyptic number.

131012123 is a deficient number, since it is larger than the sum of its proper divisors (11910205).

131012123 is a wasteful number, since it uses less digits than its factorization.

131012123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11910204.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 131012123 is about 11446.0527257216. The cubic root of 131012123 is about 507.8909739263.

Adding to 131012123 its reverse (321210131), we get a palindrome (452222254).

The spelling of 131012123 in words is "one hundred thirty-one million, twelve thousand, one hundred twenty-three".

Divisors: 1 11 11910193 131012123