31061820231 has 24 divisors (see below), whose sum is σ = 49877050496. Its totient is φ = 18498352320.

The previous prime is 31061820227. The next prime is 31061820263. The reversal of 31061820231 is 13202816013.

It is a happy number.

31061820231 is a `hidden beast` number, since 3 + 1 + 0 + 618 + 20 + 23 + 1 = 666.

It is not a de Polignac number, because 31061820231 - 2² = 31061820227 is a prime.

It is a super-2 number, since 2×31061820231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31061820195 and 31061820204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31061820131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4278400 + ... + 4285653.

Almost surely, 2^31061820231 is an apocalyptic number.

31061820231 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31061820231 is a deficient number, since it is larger than the sum of its proper divisors (18815230265).

31061820231 is a wasteful number, since it uses less digits than its factorization.

31061820231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8564103 (or 8564100 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 31061820231 in words is "thirty-one billion, sixty-one million, eight hundred twenty thousand, two hundred thirty-one".