31431031420 has 48 divisors (see below), whose sum is σ = 66245594688. Its totient is φ = 12526707200.

The previous prime is 31431031351. The next prime is 31431031433. The reversal of 31431031420 is 2413013413.

It is a super-2 number, since 2×31431031420² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31431031391 and 31431031400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7049832 + ... + 7054288.

It is an arithmetic number, because the mean of its divisors is an integer number (1380116556).

Almost surely, 2^31431031420 is an apocalyptic number.

It is an amenable number.

31431031420 is an abundant number, since it is smaller than the sum of its proper divisors (34814563268).

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

31431031420 is a wasteful number, since it uses less digits than its factorization.

31431031420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5670 (or 5668 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31431031420 its reverse (2413013413), we get a palindrome (33844044833).

The spelling of 31431031420 in words is "thirty-one billion, four hundred thirty-one million, thirty-one thousand, four hundred twenty".