620971931 has 4 divisors (see below), whose sum is σ = 621024864. Its totient is φ = 620919000.

The previous prime is 620971877. The next prime is 620971933. The reversal of 620971931 is 139179026.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 620971931 - 2¹⁰ = 620970907 is a prime.

It is a super-2 number, since 2×620971931² = 771212278179737522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620971933) 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, 140 + ... + 35241.

It is an arithmetic number, because the mean of its divisors is an integer number (155256216).

Almost surely, 2^620971931 is an apocalyptic number.

620971931 is a deficient number, since it is larger than the sum of its proper divisors (52933).

620971931 is a wasteful number, since it uses less digits than its factorization.

620971931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52932.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 620971931 is about 24919.3083973051. The cubic root of 620971931 is about 853.1472395746.

The spelling of 620971931 in words is "six hundred twenty million, nine hundred seventy-one thousand, nine hundred thirty-one".