31404004331 has 4 divisors (see below), whose sum is σ = 35890290672. Its totient is φ = 26917717992.

The previous prime is 31404004321. The next prime is 31404004337. The reversal of 31404004331 is 13340040413.

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 31404004331 - 2¹⁰ = 31404003307 is a prime.

It is a super-2 number, since 2×31404004331² (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 = 31404004297 and 31404004306.

It is not an unprimeable number, because it can be changed into a prime (31404004337) 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, 2243143160 + ... + 2243143173.

It is an arithmetic number, because the mean of its divisors is an integer number (8972572668).

Almost surely, 2^31404004331 is an apocalyptic number.

31404004331 is a deficient number, since it is larger than the sum of its proper divisors (4486286341).

31404004331 is an equidigital number, since it uses as much as digits as its factorization.

31404004331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4486286340.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31404004331 its reverse (13340040413), we get a palindrome (44744044744).

The spelling of 31404004331 in words is "thirty-one billion, four hundred four million, four thousand, three hundred thirty-one".