31450720161 has 16 divisors (see below), whose sum is σ = 47929618304. Its totient is φ = 17970073344.

The previous prime is 31450720157. The next prime is 31450720163. The reversal of 31450720161 is 16102705413.

It is not a de Polignac number, because 31450720161 - 2² = 31450720157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31450720163) 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, 162735 + ... + 298971.

It is an arithmetic number, because the mean of its divisors is an integer number (2995601144).

Almost surely, 2^31450720161 is an apocalyptic number.

It is an amenable number.

31450720161 is a deficient number, since it is larger than the sum of its proper divisors (16478898143).

31450720161 is a wasteful number, since it uses less digits than its factorization.

31450720161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147240.

The product of its (nonzero) digits is 5040, while the sum is 30.

The spelling of 31450720161 in words is "thirty-one billion, four hundred fifty million, seven hundred twenty thousand, one hundred sixty-one".