31220431432040 has 16 divisors (see below), whose sum is σ = 70245970722180. Its totient is φ = 12488172572800.

The previous prime is 31220431432039. The next prime is 31220431432051. The reversal of 31220431432040 is 4023413402213.

It can be written as a sum of positive squares in 2 ways, for example, as 28822746417124 + 2397685014916 = 5368682^2 + 1548446^2 .

It is a super-2 number, since 2×31220431432040² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31220431431994 and 31220431432012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390255392861 + ... + 390255392940.

Almost surely, 2^{31220431432040} is an apocalyptic number.

It is an amenable number.

31220431432040 is an abundant number, since it is smaller than the sum of its proper divisors (39025539290140).

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

31220431432040 is a wasteful number, since it uses less digits than its factorization.

31220431432040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780510785812 (or 780510785808 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 31220431432040 its reverse (4023413402213), we get a palindrome (35243844834253).

The spelling of 31220431432040 in words is "thirty-one trillion, two hundred twenty billion, four hundred thirty-one million, four hundred thirty-two thousand, forty".