31201020191 has 6 divisors (see below), whose sum is σ = 34295336376. Its totient is φ = 28364563700.

The previous prime is 31201020173. The next prime is 31201020239. The reversal of 31201020191 is 19102010213.

It is not a de Polignac number, because 31201020191 - 2²⁶ = 31133911327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201020391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128929715 + ... + 128929956.

It is an arithmetic number, because the mean of its divisors is an integer number (5715889396).

Almost surely, 2^31201020191 is an apocalyptic number.

31201020191 is a deficient number, since it is larger than the sum of its proper divisors (3094316185).

31201020191 is a wasteful number, since it uses less digits than its factorization.

31201020191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257859693 (or 257859682 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 31201020191 in words is "thirty-one billion, two hundred one million, twenty thousand, one hundred ninety-one".