31964941981 has 16 divisors (see below), whose sum is σ = 36711650304. Its totient is φ = 27263418624.

The previous prime is 31964941979. The next prime is 31964941997. The reversal of 31964941981 is 18914946913.

It is a cyclic number.

It is not a de Polignac number, because 31964941981 - 2¹ = 31964941979 is a prime.

It is a super-2 number, since 2×31964941981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31964941961) 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, 5924421 + ... + 5929813.

It is an arithmetic number, because the mean of its divisors is an integer number (2294478144).

Almost surely, 2^31964941981 is an apocalyptic number.

It is an amenable number.

31964941981 is a deficient number, since it is larger than the sum of its proper divisors (4746708323).

31964941981 is a wasteful number, since it uses less digits than its factorization.

31964941981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9420.

The product of its digits is 1679616, while the sum is 55.

The spelling of 31964941981 in words is "thirty-one billion, nine hundred sixty-four million, nine hundred forty-one thousand, nine hundred eighty-one".