31201131020 has 24 divisors (see below), whose sum is σ = 65546963664. Its totient is φ = 12475768896.

The previous prime is 31201130981. The next prime is 31201131023. The reversal of 31201131020 is 2013110213.

It is a junction number, because it is equal to n+sod(n) for n = 31201130986 and 31201131004.

It is not an unprimeable number, because it can be changed into a prime (31201131023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237842 + ... + 344921.

It is an arithmetic number, because the mean of its divisors is an integer number (2731123486).

Almost surely, 2^31201131020 is an apocalyptic number.

It is an amenable number.

31201131020 is an abundant number, since it is smaller than the sum of its proper divisors (34345832644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31201131020 is a wasteful number, since it uses less digits than its factorization.

31201131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585449 (or 585447 counting only the distinct ones).

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

Adding to 31201131020 its reverse (2013110213), we get a palindrome (33214241233).

The spelling of 31201131020 in words is "thirty-one billion, two hundred one million, one hundred thirty-one thousand, twenty".