31220113311 has 16 divisors (see below), whose sum is σ = 46258291200. Its totient is φ = 20810586744.

The previous prime is 31220113291. The next prime is 31220113319. The reversal of 31220113311 is 11331102213.

31220113311 is a `hidden beast` number, since 312 + 20 + 1 + 1 + 331 + 1 = 666.

It is not a de Polignac number, because 31220113311 - 2⁶ = 31220113247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220113319) 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, 134980 + ... + 284006.

It is an arithmetic number, because the mean of its divisors is an integer number (2891143200).

Almost surely, 2^31220113311 is an apocalyptic number.

31220113311 is a deficient number, since it is larger than the sum of its proper divisors (15038177889).

31220113311 is a wasteful number, since it uses less digits than its factorization.

31220113311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156795 (or 156789 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31220113311 its reverse (11331102213), we get a palindrome (42551215524).

The spelling of 31220113311 in words is "thirty-one billion, two hundred twenty million, one hundred thirteen thousand, three hundred eleven".