31321010231 has 16 divisors (see below), whose sum is σ = 36781384704. Its totient is φ = 26114133024.

The previous prime is 31321010197. The next prime is 31321010249. The reversal of 31321010231 is 13201012313.

It is a de Polignac number, because none of the positive numbers 2^k-31321010231 is a prime.

It is a super-2 number, since 2×31321010231² (a number of 22 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 (31321010291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238400 + ... + 345653.

It is an arithmetic number, because the mean of its divisors is an integer number (2298836544).

Almost surely, 2^31321010231 is an apocalyptic number.

31321010231 is a deficient number, since it is larger than the sum of its proper divisors (5460374473).

31321010231 is a wasteful number, since it uses less digits than its factorization.

31321010231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584270.

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

Adding to 31321010231 its reverse (13201012313), we get a palindrome (44522022544).

The spelling of 31321010231 in words is "thirty-one billion, three hundred twenty-one million, ten thousand, two hundred thirty-one".