31528618969 has 9 divisors (see below), whose sum is σ = 32410527807. Its totient is φ = 30670101864.

The previous prime is 31528618949. The next prime is 31528619053. The reversal of 31528618969 is 96981682513.

The square root of 31528618969 is 177563.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 28212241225 + 3316377744 = 167965^2 + 57588^2 .

It is not a de Polignac number, because 31528618969 - 2⁷ = 31528618841 is a prime.

It is a super-2 number, since 2×31528618969² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31528618939) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6567432 + ... + 6572230.

Almost surely, 2^31528618969 is an apocalyptic number.

31528618969 is the 177563-rd square number.

31528618969 is the 88782-nd centered octagonal number.

It is an amenable number.

31528618969 is a deficient number, since it is larger than the sum of its proper divisors (881908838).

31528618969 is an frugal number, since it uses more digits than its factorization.

31528618969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9672 (or 4836 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 58.

The spelling of 31528618969 in words is "thirty-one billion, five hundred twenty-eight million, six hundred eighteen thousand, nine hundred sixty-nine".