31913213901 has 8 divisors (see below), whose sum is σ = 43248508704. Its totient is φ = 20926697520.

The previous prime is 31913213819. The next prime is 31913213939. The reversal of 31913213901 is 10931231913.

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

It is not a de Polignac number, because 31913213901 - 2¹⁷ = 31913082829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31913213701) 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, 87194391 + ... + 87194756.

It is an arithmetic number, because the mean of its divisors is an integer number (5406063588).

Almost surely, 2^31913213901 is an apocalyptic number.

It is an amenable number.

31913213901 is a deficient number, since it is larger than the sum of its proper divisors (11335294803).

31913213901 is a wasteful number, since it uses less digits than its factorization.

31913213901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174389211.

The product of its (nonzero) digits is 4374, while the sum is 33.

The spelling of 31913213901 in words is "thirty-one billion, nine hundred thirteen million, two hundred thirteen thousand, nine hundred one".