157506731 has 4 divisors (see below), whose sum is σ = 157724112. Its totient is φ = 157289352.

The previous prime is 157506703. The next prime is 157506733. The reversal of 157506731 is 137605751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137605751 = 4649 ⋅29599.

It is a cyclic number.

It is not a de Polignac number, because 157506731 - 2⁶ = 157506667 is a prime.

It is a super-2 number, since 2×157506731² = 49616740620612722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 157506691 and 157506700.

It is not an unprimeable number, because it can be changed into a prime (157506733) 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, 107600 + ... + 109053.

It is an arithmetic number, because the mean of its divisors is an integer number (39431028).

Almost surely, 2^157506731 is an apocalyptic number.

157506731 is a deficient number, since it is larger than the sum of its proper divisors (217381).

157506731 is an equidigital number, since it uses as much as digits as its factorization.

157506731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217380.

The product of its (nonzero) digits is 22050, while the sum is 35.

The square root of 157506731 is about 12550.1685646050. The cubic root of 157506731 is about 540.0488421757.

The spelling of 157506731 in words is "one hundred fifty-seven million, five hundred six thousand, seven hundred thirty-one".