31404321031 has 4 divisors (see below), whose sum is σ = 31421197864. Its totient is φ = 31387444200.

The previous prime is 31404321023. The next prime is 31404321037. The reversal of 31404321031 is 13012340413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31404321031 - 2³ = 31404321023 is a prime.

It is a super-2 number, since 2×31404321031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31404320993 and 31404321011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31404321037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8435625 + ... + 8439346.

It is an arithmetic number, because the mean of its divisors is an integer number (7855299466).

Almost surely, 2^31404321031 is an apocalyptic number.

31404321031 is a deficient number, since it is larger than the sum of its proper divisors (16876833).

31404321031 is a wasteful number, since it uses less digits than its factorization.

31404321031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16876832.

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

Adding to 31404321031 its reverse (13012340413), we get a palindrome (44416661444).

The spelling of 31404321031 in words is "thirty-one billion, four hundred four million, three hundred twenty-one thousand, thirty-one".