157655431 has 2 divisors, whose sum is σ = 157655432. Its totient is φ = 157655430.

The previous prime is 157655417. The next prime is 157655461. The reversal of 157655431 is 134556751.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157655431 is a prime.

It is a super-2 number, since 2×157655431² = 49710469847591522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157655461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78827715 + 78827716.

It is an arithmetic number, because the mean of its divisors is an integer number (78827716).

Almost surely, 2^157655431 is an apocalyptic number.

157655431 is a deficient number, since it is larger than the sum of its proper divisors (1).

157655431 is an equidigital number, since it uses as much as digits as its factorization.

157655431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 37.

The square root of 157655431 is about 12556.0913902376. The cubic root of 157655431 is about 540.2187396860.

The spelling of 157655431 in words is "one hundred fifty-seven million, six hundred fifty-five thousand, four hundred thirty-one".