157643531 has 2 divisors, whose sum is σ = 157643532. Its totient is φ = 157643530.

The previous prime is 157643509. The next prime is 157643557. The reversal of 157643531 is 135346751.

157643531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 157643531 - 2⁶ = 157643467 is a prime.

It is a super-2 number, since 2×157643531² = 49702965732295922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 157643491 and 157643500.

It is not a weakly prime, because it can be changed into another prime (157643561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78821765 + 78821766.

It is an arithmetic number, because the mean of its divisors is an integer number (78821766).

Almost surely, 2^157643531 is an apocalyptic number.

157643531 is a deficient number, since it is larger than the sum of its proper divisors (1).

157643531 is an equidigital number, since it uses as much as digits as its factorization.

157643531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 35.

The square root of 157643531 is about 12555.6175077134. The cubic root of 157643531 is about 540.2051472485.

The spelling of 157643531 in words is "one hundred fifty-seven million, six hundred forty-three thousand, five hundred thirty-one".