31431323413397 has 4 divisors (see below), whose sum is σ = 32515162151820. Its totient is φ = 30347484674976.

The previous prime is 31431323413379. The next prime is 31431323413409. The reversal of 31431323413397 is 79331432313413.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19177340089636 + 12253983323761 = 4379194^2 + 3500569^2 .

It is a cyclic number.

It is not a de Polignac number, because 31431323413397 - 2⁶ = 31431323413333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31431323413327) 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, 541919369168 + ... + 541919369225.

It is an arithmetic number, because the mean of its divisors is an integer number (8128790537955).

Almost surely, 2^{31431323413397} is an apocalyptic number.

It is an amenable number.

31431323413397 is a deficient number, since it is larger than the sum of its proper divisors (1083838738423).

31431323413397 is a wasteful number, since it uses less digits than its factorization.

31431323413397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083838738422.

The product of its digits is 1469664, while the sum is 47.

The spelling of 31431323413397 in words is "thirty-one trillion, four hundred thirty-one billion, three hundred twenty-three million, four hundred thirteen thousand, three hundred ninety-seven".