31494399771 has 4 divisors (see below), whose sum is σ = 41992533032. Its totient is φ = 20996266512.

The previous prime is 31494399763. The next prime is 31494399809. The reversal of 31494399771 is 17799349413.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31494399771 - 2³ = 31494399763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31494399751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5249066626 + ... + 5249066631.

It is an arithmetic number, because the mean of its divisors is an integer number (10498133258).

Almost surely, 2^31494399771 is an apocalyptic number.

31494399771 is a deficient number, since it is larger than the sum of its proper divisors (10498133261).

31494399771 is a wasteful number, since it uses less digits than its factorization.

31494399771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10498133260.

The product of its digits is 5143824, while the sum is 57.

The spelling of 31494399771 in words is "thirty-one billion, four hundred ninety-four million, three hundred ninety-nine thousand, seven hundred seventy-one".