31681015949 has 16 divisors (see below), whose sum is σ = 34991426304. Its totient is φ = 28444147200.

The previous prime is 31681015939. The next prime is 31681015963. The reversal of 31681015949 is 94951018613.

It is a cyclic number.

It is not a de Polignac number, because 31681015949 - 2²⁴ = 31664238733 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 (31681015939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 303932 + ... + 394634.

It is an arithmetic number, because the mean of its divisors is an integer number (2186964144).

Almost surely, 2^31681015949 is an apocalyptic number.

It is an amenable number.

31681015949 is a deficient number, since it is larger than the sum of its proper divisors (3310410355).

31681015949 is a wasteful number, since it uses less digits than its factorization.

31681015949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91108.

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 31681015949 in words is "thirty-one billion, six hundred eighty-one million, fifteen thousand, nine hundred forty-nine".