31403421131 has 2 divisors, whose sum is σ = 31403421132. Its totient is φ = 31403421130.

The previous prime is 31403421089. The next prime is 31403421143. The reversal of 31403421131 is 13112430413.

It is a strong prime.

It is an emirp because it is prime and its reverse (13112430413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31403421131 - 2⁶ = 31403421067 is a prime.

It is a super-2 number, since 2×31403421131² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31403421097 and 31403421106.

It is not a weakly prime, because it can be changed into another prime (31403429131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15701710565 + 15701710566.

It is an arithmetic number, because the mean of its divisors is an integer number (15701710566).

Almost surely, 2^31403421131 is an apocalyptic number.

31403421131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31403421131 is an equidigital number, since it uses as much as digits as its factorization.

31403421131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31403421131 its reverse (13112430413), we get a palindrome (44515851544).

The spelling of 31403421131 in words is "thirty-one billion, four hundred three million, four hundred twenty-one thousand, one hundred thirty-one".