31321000013231 has 16 divisors (see below), whose sum is σ = 32129617748256. Its totient is φ = 30514516800000.

The previous prime is 31321000013221. The next prime is 31321000013243. The reversal of 31321000013231 is 13231000012313.

It is a cyclic number.

It is not a de Polignac number, because 31321000013231 - 2¹⁸ = 31320999751087 is a prime.

It is a super-2 number, since 2×31321000013231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321000013201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 496095536 + ... + 496158666.

It is an arithmetic number, because the mean of its divisors is an integer number (2008101109266).

Almost surely, 2^{31321000013231} is an apocalyptic number.

31321000013231 is a deficient number, since it is larger than the sum of its proper divisors (808617735025).

31321000013231 is a wasteful number, since it uses less digits than its factorization.

31321000013231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79834.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31321000013231 its reverse (13231000012313), we get a palindrome (44552000025544).

The spelling of 31321000013231 in words is "thirty-one trillion, three hundred twenty-one billion, thirteen thousand, two hundred thirty-one".