31112020031 has 4 divisors (see below), whose sum is σ = 31773977952. Its totient is φ = 30450062112.

The previous prime is 31112020013. The next prime is 31112020063. The reversal of 31112020031 is 13002021113.

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

It is a cyclic number.

It is not a de Polignac number, because 31112020031 - 2¹⁰ = 31112019007 is a prime.

It is a super-2 number, since 2×31112020031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31112019988 and 31112020015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112020831) 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, 330978890 + ... + 330978983.

It is an arithmetic number, because the mean of its divisors is an integer number (7943494488).

Almost surely, 2^31112020031 is an apocalyptic number.

31112020031 is a deficient number, since it is larger than the sum of its proper divisors (661957921).

31112020031 is an equidigital number, since it uses as much as digits as its factorization.

31112020031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661957920.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31112020031 its reverse (13002021113), we get a palindrome (44114041144).

The spelling of 31112020031 in words is "thirty-one billion, one hundred twelve million, twenty thousand, thirty-one".