157523731 has 4 divisors (see below), whose sum is σ = 157551264. Its totient is φ = 157496200.

The previous prime is 157523719. The next prime is 157523747. The reversal of 157523731 is 137325751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137325751 = 1097 ⋅125183.

It is a cyclic number.

It is not a de Polignac number, because 157523731 - 2¹⁷ = 157392659 is a prime.

It is a super-2 number, since 2×157523731² = 49627451656320722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157523131) 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, 1600 + ... + 17821.

It is an arithmetic number, because the mean of its divisors is an integer number (39387816).

Almost surely, 2^157523731 is an apocalyptic number.

157523731 is a deficient number, since it is larger than the sum of its proper divisors (27533).

157523731 is an equidigital number, since it uses as much as digits as its factorization.

157523731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27532.

The product of its digits is 22050, while the sum is 34.

The square root of 157523731 is about 12550.8458280707. The cubic root of 157523731 is about 540.0682709751.

The spelling of 157523731 in words is "one hundred fifty-seven million, five hundred twenty-three thousand, seven hundred thirty-one".