31323121310 has 32 divisors (see below), whose sum is σ = 60912734400. Its totient is φ = 11528494848.

The previous prime is 31323121309. The next prime is 31323121381. The reversal of 31323121310 is 1312132313.

It is a super-2 number, since 2×31323121310² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 344210 + ... + 425589.

It is an arithmetic number, because the mean of its divisors is an integer number (1903522950).

Almost surely, 2^31323121310 is an apocalyptic number.

31323121310 is a deficient number, since it is larger than the sum of its proper divisors (29589613090).

31323121310 is a wasteful number, since it uses less digits than its factorization.

31323121310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770132.

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

Adding to 31323121310 its reverse (1312132313), we get a palindrome (32635253623).

The spelling of 31323121310 in words is "thirty-one billion, three hundred twenty-three million, one hundred twenty-one thousand, three hundred ten".