31745348691 has 32 divisors (see below), whose sum is σ = 49535961600. Its totient is φ = 18075933792.

The previous prime is 31745348671. The next prime is 31745348699. The reversal of 31745348691 is 19684354713.

It is not a de Polignac number, because 31745348691 - 2⁷ = 31745348563 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (31745348699) 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 31 ways as a sum of consecutive naturals, for example, 236701 + ... + 345713.

It is an arithmetic number, because the mean of its divisors is an integer number (1547998800).

Almost surely, 2^31745348691 is an apocalyptic number.

31745348691 is a deficient number, since it is larger than the sum of its proper divisors (17790612909).

31745348691 is a wasteful number, since it uses less digits than its factorization.

31745348691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109320 (or 109306 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 51.

The spelling of 31745348691 in words is "thirty-one billion, seven hundred forty-five million, three hundred forty-eight thousand, six hundred ninety-one".