31994197145 has 8 divisors (see below), whose sum is σ = 38933784000. Its totient is φ = 25234859440.

The previous prime is 31994197139. The next prime is 31994197159. The reversal of 31994197145 is 54179149913.

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

It is not a de Polignac number, because 31994197145 - 2²⁰ = 31993148569 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45061895 + ... + 45062604.

It is an arithmetic number, because the mean of its divisors is an integer number (4866723000).

Almost surely, 2^31994197145 is an apocalyptic number.

It is an amenable number.

31994197145 is a deficient number, since it is larger than the sum of its proper divisors (6939586855).

31994197145 is an equidigital number, since it uses as much as digits as its factorization.

31994197145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90124575.

The product of its digits is 1224720, while the sum is 53.

The spelling of 31994197145 in words is "thirty-one billion, nine hundred ninety-four million, one hundred ninety-seven thousand, one hundred forty-five".