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242643381 = 3536722777
BaseRepresentation
bin11100111011001…
…11000110110101
3121220120120010220
432131213012311
5444104042011
640024404553
76004302051
oct1635470665
9556516126
10242643381
11114a69622
1269316759
133b368086
1424322c61
151647e506
hexe7671b5

242643381 has 16 divisors (see below), whose sum is σ = 334563264. Its totient is φ = 156334464.

The previous prime is 242643347. The next prime is 242643391. The reversal of 242643381 is 183346242.

It is not a de Polignac number, because 242643381 - 213 = 242635189 is a prime.

It is a super-2 number, since 2×2426433812 = 117751620686222322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242643301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736 + ... + 22041.

It is an arithmetic number, because the mean of its divisors is an integer number (20910204).

Almost surely, 2242643381 is an apocalyptic number.

It is an amenable number.

242643381 is a deficient number, since it is larger than the sum of its proper divisors (91919883).

242643381 is a wasteful number, since it uses less digits than its factorization.

242643381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22900.

The product of its digits is 27648, while the sum is 33.

The square root of 242643381 is about 15577.0145085636. The cubic root of 242643381 is about 623.7197310356.

The spelling of 242643381 in words is "two hundred forty-two million, six hundred forty-three thousand, three hundred eighty-one".

Divisors: 1 3 53 67 159 201 3551 10653 22777 68331 1207181 1526059 3621543 4578177 80881127 242643381