31601566361 has 8 divisors (see below), whose sum is σ = 31963909824. Its totient is φ = 31241058160.

The previous prime is 31601566291. The next prime is 31601566379. The reversal of 31601566361 is 16366510613.

It is a happy number.

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

It is not a de Polignac number, because 31601566361 - 2²⁶ = 31534457497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31601565361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424166 + ... + 493071.

It is an arithmetic number, because the mean of its divisors is an integer number (3995488728).

Almost surely, 2^31601566361 is an apocalyptic number.

It is an amenable number.

31601566361 is a deficient number, since it is larger than the sum of its proper divisors (362343463).

31601566361 is a wasteful number, since it uses less digits than its factorization.

31601566361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917631.

The product of its (nonzero) digits is 58320, while the sum is 38.

The spelling of 31601566361 in words is "thirty-one billion, six hundred one million, five hundred sixty-six thousand, three hundred sixty-one".