31140771771 has 4 divisors (see below), whose sum is σ = 41521029032. Its totient is φ = 20760514512.

The previous prime is 31140771733. The next prime is 31140771821. The reversal of 31140771771 is 17717704113.

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

It is a de Polignac number, because none of the positive numbers 2^k-31140771771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31140771671) 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, 5190128626 + ... + 5190128631.

It is an arithmetic number, because the mean of its divisors is an integer number (10380257258).

Almost surely, 2^31140771771 is an apocalyptic number.

31140771771 is a deficient number, since it is larger than the sum of its proper divisors (10380257261).

31140771771 is a wasteful number, since it uses less digits than its factorization.

31140771771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10380257260.

The product of its (nonzero) digits is 28812, while the sum is 39.

The spelling of 31140771771 in words is "thirty-one billion, one hundred forty million, seven hundred seventy-one thousand, seven hundred seventy-one".