31422216157 has 4 divisors (see below), whose sum is σ = 31423731840. Its totient is φ = 31420700476.

The previous prime is 31422216149. The next prime is 31422216191. The reversal of 31422216157 is 75161222413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31422216157 - 2³ = 31422216149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31422216257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726307 + ... + 768352.

It is an arithmetic number, because the mean of its divisors is an integer number (7855932960).

Almost surely, 2^31422216157 is an apocalyptic number.

It is an amenable number.

31422216157 is a deficient number, since it is larger than the sum of its proper divisors (1515683).

31422216157 is a wasteful number, since it uses less digits than its factorization.

31422216157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515682.

The product of its digits is 20160, while the sum is 34.

The spelling of 31422216157 in words is "thirty-one billion, four hundred twenty-two million, two hundred sixteen thousand, one hundred fifty-seven".