31321002131 has 4 divisors (see below), whose sum is σ = 31327709352. Its totient is φ = 31314294912.

The previous prime is 31321002101. The next prime is 31321002149. The reversal of 31321002131 is 13120012313.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321002131 is a prime.

It is a super-2 number, since 2×31321002131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31321002101) 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, 3346601 + ... + 3355946.

It is an arithmetic number, because the mean of its divisors is an integer number (7831927338).

Almost surely, 2^31321002131 is an apocalyptic number.

31321002131 is a deficient number, since it is larger than the sum of its proper divisors (6707221).

31321002131 is an equidigital number, since it uses as much as digits as its factorization.

31321002131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707220.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31321002131 its reverse (13120012313), we get a palindrome (44441014444).

The spelling of 31321002131 in words is "thirty-one billion, three hundred twenty-one million, two thousand, one hundred thirty-one".