31401622161 has 64 divisors (see below), whose sum is σ = 58337072640. Its totient is φ = 16250906880.

The previous prime is 31401622159. The next prime is 31401622181. The reversal of 31401622161 is 16122610413.

It is a happy number.

31401622161 is a `hidden beast` number, since 31 + 4 + 0 + 1 + 622 + 1 + 6 + 1 = 666.

It is not a de Polignac number, because 31401622161 - 2¹ = 31401622159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31401622121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9651 + ... + 250791.

It is an arithmetic number, because the mean of its divisors is an integer number (911516760).

Almost surely, 2^31401622161 is an apocalyptic number.

It is an amenable number.

31401622161 is a deficient number, since it is larger than the sum of its proper divisors (26935450479).

31401622161 is a wasteful number, since it uses less digits than its factorization.

31401622161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241223 (or 241217 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 31401622161 in words is "thirty-one billion, four hundred one million, six hundred twenty-two thousand, one hundred sixty-one".