157871731 has 4 divisors (see below), whose sum is σ = 161230752. Its totient is φ = 154512712.

The previous prime is 157871729. The next prime is 157871743. The reversal of 157871731 is 137178751.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 157871731 - 2¹ = 157871729 is a prime.

It is a super-2 number, since 2×157871731² = 49846966897872722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157871431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1679440 + ... + 1679533.

It is an arithmetic number, because the mean of its divisors is an integer number (40307688).

Almost surely, 2^157871731 is an apocalyptic number.

157871731 is a deficient number, since it is larger than the sum of its proper divisors (3359021).

157871731 is an equidigital number, since it uses as much as digits as its factorization.

157871731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3359020.

The product of its digits is 41160, while the sum is 40.

The square root of 157871731 is about 12564.7017871496. The cubic root of 157871731 is about 540.4656831099.

The spelling of 157871731 in words is "one hundred fifty-seven million, eight hundred seventy-one thousand, seven hundred thirty-one".