620919961 has 4 divisors (see below), whose sum is σ = 634131072. Its totient is φ = 607708852.

The previous prime is 620919911. The next prime is 620919991. The reversal of 620919961 is 169919026.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 620919961 - 2⁷ = 620919833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620919911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6605485 + ... + 6605578.

It is an arithmetic number, because the mean of its divisors is an integer number (158532768).

Almost surely, 2^620919961 is an apocalyptic number.

It is an amenable number.

620919961 is a deficient number, since it is larger than the sum of its proper divisors (13211111).

620919961 is a wasteful number, since it uses less digits than its factorization.

620919961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13211110.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 620919961 is about 24918.2656097891. The cubic root of 620919961 is about 853.1234385531.

The spelling of 620919961 in words is "six hundred twenty million, nine hundred nineteen thousand, nine hundred sixty-one".