31981096317723 has 32 divisors (see below), whose sum is σ = 48756338104320. Its totient is φ = 18266199490560.

The previous prime is 31981096317719. The next prime is 31981096317727. The reversal of 31981096317723 is 32771369018913.

It is an interprime number because it is at equal distance from previous prime (31981096317719) and next prime (31981096317727).

It is not a de Polignac number, because 31981096317723 - 2² = 31981096317719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31981096317727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 458403163 + ... + 458472923.

It is an arithmetic number, because the mean of its divisors is an integer number (1523635565760).

Almost surely, 2^{31981096317723} is an apocalyptic number.

31981096317723 is a deficient number, since it is larger than the sum of its proper divisors (16775241786597).

31981096317723 is a wasteful number, since it uses less digits than its factorization.

31981096317723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79867.

The product of its (nonzero) digits is 10287648, while the sum is 60.

The spelling of 31981096317723 in words is "thirty-one trillion, nine hundred eighty-one billion, ninety-six million, three hundred seventeen thousand, seven hundred twenty-three".