621563057 has 2 divisors, whose sum is σ = 621563058. Its totient is φ = 621563056.

The previous prime is 621563029. The next prime is 621563069. The reversal of 621563057 is 750365126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581822641 + 39740416 = 24121^2 + 6304^2 .

It is a cyclic number.

It is not a de Polignac number, because 621563057 - 2¹⁸ = 621300913 is a prime.

It is a Chen prime.

It is equal to p_32390594 and since 621563057 and 32390594 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (621563077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310781528 + 310781529.

It is an arithmetic number, because the mean of its divisors is an integer number (310781529).

Almost surely, 2^621563057 is an apocalyptic number.

It is an amenable number.

621563057 is a deficient number, since it is larger than the sum of its proper divisors (1).

621563057 is an equidigital number, since it uses as much as digits as its factorization.

621563057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 621563057 is about 24931.1663786514. The cubic root of 621563057 is about 853.4178677885.

The spelling of 621563057 in words is "six hundred twenty-one million, five hundred sixty-three thousand, fifty-seven".