31020013231 has 8 divisors (see below), whose sum is σ = 31333157024. Its totient is φ = 30707100000.

The previous prime is 31020013163. The next prime is 31020013243. The reversal of 31020013231 is 13231002013.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31020013231 - 2¹³ = 31020005039 is a prime.

It is a super-2 number, since 2×31020013231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020013261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219481 + ... + 331981.

It is an arithmetic number, because the mean of its divisors is an integer number (3916644628).

Almost surely, 2^31020013231 is an apocalyptic number.

31020013231 is a deficient number, since it is larger than the sum of its proper divisors (313143793).

31020013231 is a wasteful number, since it uses less digits than its factorization.

31020013231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115281.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31020013231 its reverse (13231002013), we get a palindrome (44251015244).

The spelling of 31020013231 in words is "thirty-one billion, twenty million, thirteen thousand, two hundred thirty-one".