31613221325 has 24 divisors (see below), whose sum is σ = 45050777280. Its totient is φ = 21556512000.

The previous prime is 31613221313. The next prime is 31613221331. The reversal of 31613221325 is 52312231613.

It is a happy number.

It is not a de Polignac number, because 31613221325 - 2⁸ = 31613221069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 473276 + ... + 535925.

It is an arithmetic number, because the mean of its divisors is an integer number (1877115720).

Almost surely, 2^31613221325 is an apocalyptic number.

31613221325 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31613221325 is a deficient number, since it is larger than the sum of its proper divisors (13437555955).

31613221325 is a wasteful number, since it uses less digits than its factorization.

31613221325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009397 (or 1009392 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

Adding to 31613221325 its reverse (52312231613), we get a palindrome (83925452938).

The spelling of 31613221325 in words is "thirty-one billion, six hundred thirteen million, two hundred twenty-one thousand, three hundred twenty-five".