31320101516231 has 32 divisors (see below), whose sum is σ = 34901587499328. Its totient is φ = 27863828029440.

The previous prime is 31320101516227. The next prime is 31320101516239. The reversal of 31320101516231 is 13261510102313.

It is a cyclic number.

It is not a de Polignac number, because 31320101516231 - 2² = 31320101516227 is a prime.

It is a super-2 number, since 2×31320101516231² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31320101516194 and 31320101516203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320101516239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 408003905 + ... + 408080661.

It is an arithmetic number, because the mean of its divisors is an integer number (1090674609354).

Almost surely, 2^{31320101516231} is an apocalyptic number.

31320101516231 is a deficient number, since it is larger than the sum of its proper divisors (3581485983097).

31320101516231 is a wasteful number, since it uses less digits than its factorization.

31320101516231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78611.

The product of its (nonzero) digits is 3240, while the sum is 29.

Adding to 31320101516231 its reverse (13261510102313), we get a palindrome (44581611618544).

The spelling of 31320101516231 in words is "thirty-one trillion, three hundred twenty billion, one hundred one million, five hundred sixteen thousand, two hundred thirty-one".