31913021111 has 8 divisors (see below), whose sum is σ = 33302345184. Its totient is φ = 30523847200.

The previous prime is 31913021089. The next prime is 31913021123. The reversal of 31913021111 is 11112031913.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31913021111 is a prime.

It is a super-2 number, since 2×31913021111² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31913021131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736961 + ... + 779061.

It is an arithmetic number, because the mean of its divisors is an integer number (4162793148).

Almost surely, 2^31913021111 is an apocalyptic number.

31913021111 is a deficient number, since it is larger than the sum of its proper divisors (1389324073).

31913021111 is a wasteful number, since it uses less digits than its factorization.

31913021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75081.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 31913021111 in words is "thirty-one billion, nine hundred thirteen million, twenty-one thousand, one hundred eleven".