31220440004131 has 96 divisors (see below), whose sum is σ = 39308737413120. Its totient is φ = 24647147078400.

The previous prime is 31220440004111. The next prime is 31220440004183. The reversal of 31220440004131 is 13140004402213.

It is not a de Polignac number, because 31220440004131 - 2⁷ = 31220440004003 is a prime.

It is a super-2 number, since 2×31220440004131² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31220440004096 and 31220440004105.

It is not an unprimeable number, because it can be changed into a prime (31220440004111) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1954567861 + ... + 1954583833.

It is an arithmetic number, because the mean of its divisors is an integer number (409466014720).

Almost surely, 2^{31220440004131} is an apocalyptic number.

31220440004131 is a deficient number, since it is larger than the sum of its proper divisors (8088297408989).

31220440004131 is a wasteful number, since it uses less digits than its factorization.

31220440004131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16465 (or 16458 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 31220440004131 its reverse (13140004402213), we get a palindrome (44360444406344).

The spelling of 31220440004131 in words is "thirty-one trillion, two hundred twenty billion, four hundred forty million, four thousand, one hundred thirty-one".