31528023137 has 4 divisors (see below), whose sum is σ = 33953255700. Its totient is φ = 29102790576.

The previous prime is 31528023127. The next prime is 31528023157. The reversal of 31528023137 is 73132082513.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10212315136 + 21315708001 = 101056^2 + 145999^2 .

It is a cyclic number.

It is not a de Polignac number, because 31528023137 - 2²⁴ = 31511245921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31528023097 and 31528023106.

It is not an unprimeable number, because it can be changed into a prime (31528023127) 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, 1212616262 + ... + 1212616287.

It is an arithmetic number, because the mean of its divisors is an integer number (8488313925).

Almost surely, 2^31528023137 is an apocalyptic number.

It is an amenable number.

31528023137 is a deficient number, since it is larger than the sum of its proper divisors (2425232563).

31528023137 is a wasteful number, since it uses less digits than its factorization.

31528023137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425232562.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 31528023137 in words is "thirty-one billion, five hundred twenty-eight million, twenty-three thousand, one hundred thirty-seven".