620838961 has 2 divisors, whose sum is σ = 620838962. Its totient is φ = 620838960.

The previous prime is 620838949. The next prime is 620838971. The reversal of 620838961 is 169838026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 572118561 + 48720400 = 23919^2 + 6980^2 .

It is a cyclic number.

It is not a de Polignac number, because 620838961 - 2¹⁷ = 620707889 is a prime.

It is not a weakly prime, because it can be changed into another prime (620838971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310419480 + 310419481.

It is an arithmetic number, because the mean of its divisors is an integer number (310419481).

Almost surely, 2^620838961 is an apocalyptic number.

It is an amenable number.

620838961 is a deficient number, since it is larger than the sum of its proper divisors (1).

620838961 is an equidigital number, since it uses as much as digits as its factorization.

620838961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 620838961 is about 24916.6402430183. The cubic root of 620838961 is about 853.0863398350.

The spelling of 620838961 in words is "six hundred twenty million, eight hundred thirty-eight thousand, nine hundred sixty-one".