157643431 has 16 divisors (see below), whose sum is σ = 182783520. Its totient is φ = 134835840.

The previous prime is 157643419. The next prime is 157643467. The reversal of 157643431 is 134346751.

It is not a de Polignac number, because 157643431 - 2¹³ = 157635239 is a prime.

It is a super-2 number, since 2×157643431² = 49702902674903522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157643531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52585 + ... + 55501.

It is an arithmetic number, because the mean of its divisors is an integer number (11423970).

Almost surely, 2^157643431 is an apocalyptic number.

157643431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

157643431 is a deficient number, since it is larger than the sum of its proper divisors (25140089).

157643431 is an equidigital number, since it uses as much as digits as its factorization.

157643431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2979 (or 2945 counting only the distinct ones).

The product of its digits is 30240, while the sum is 34.

The square root of 157643431 is about 12555.6135254316. The cubic root of 157643431 is about 540.2050330235.

The spelling of 157643431 in words is "one hundred fifty-seven million, six hundred forty-three thousand, four hundred thirty-one".