31528149161 has 4 divisors (see below), whose sum is σ = 31776402432. Its totient is φ = 31279895892.

The previous prime is 31528149157. The next prime is 31528149173. The reversal of 31528149161 is 16194182513.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16194182513 = 839 ⋅19301767.

It is a cyclic number.

It is not a de Polignac number, because 31528149161 - 2² = 31528149157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31528169161) 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, 124126445 + ... + 124126698.

It is an arithmetic number, because the mean of its divisors is an integer number (7944100608).

Almost surely, 2^31528149161 is an apocalyptic number.

It is an amenable number.

31528149161 is a deficient number, since it is larger than the sum of its proper divisors (248253271).

31528149161 is a wasteful number, since it uses less digits than its factorization.

31528149161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248253270.

The product of its digits is 51840, while the sum is 41.

The spelling of 31528149161 in words is "thirty-one billion, five hundred twenty-eight million, one hundred forty-nine thousand, one hundred sixty-one".