157788731 has 2 divisors, whose sum is σ = 157788732. Its totient is φ = 157788730.

The previous prime is 157788721. The next prime is 157788817. The reversal of 157788731 is 137887751.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157788731 is a prime.

It is a super-4 number, since 4×157788731⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 157788731 parts by 17764 straight cuts.

It is not a weakly prime, because it can be changed into another prime (157788721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78894365 + 78894366.

It is an arithmetic number, because the mean of its divisors is an integer number (78894366).

Almost surely, 2^157788731 is an apocalyptic number.

157788731 is a deficient number, since it is larger than the sum of its proper divisors (1).

157788731 is an equidigital number, since it uses as much as digits as its factorization.

157788731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 329280, while the sum is 47.

The square root of 157788731 is about 12561.3984492173. The cubic root of 157788731 is about 540.3709511080.

The spelling of 157788731 in words is "one hundred fifty-seven million, seven hundred eighty-eight thousand, seven hundred thirty-one".