621577361 has 2 divisors, whose sum is σ = 621577362. Its totient is φ = 621577360.

The previous prime is 621577309. The next prime is 621577483. The reversal of 621577361 is 163775126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 607326736 + 14250625 = 24644^2 + 3775^2 .

It is a cyclic number.

It is not a de Polignac number, because 621577361 - 2¹⁰ = 621576337 is a prime.

It is a super-3 number, since 3×621577361³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (621573361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310788680 + 310788681.

It is an arithmetic number, because the mean of its divisors is an integer number (310788681).

Almost surely, 2^621577361 is an apocalyptic number.

It is an amenable number.

621577361 is a deficient number, since it is larger than the sum of its proper divisors (1).

621577361 is an equidigital number, since it uses as much as digits as its factorization.

621577361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 621577361 is about 24931.4532468527. The cubic root of 621577361 is about 853.4244142927.

The spelling of 621577361 in words is "six hundred twenty-one million, five hundred seventy-seven thousand, three hundred sixty-one".