621086401 has 4 divisors (see below), whose sum is σ = 668862292. Its totient is φ = 573310512.

The previous prime is 621086377. The next prime is 621086413. The reversal of 621086401 is 104680126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104680126 = 2 ⋅52340063.

It can be written as a sum of positive squares in 2 ways, for example, as 373842225 + 247244176 = 19335^2 + 15724^2 .

It is a cyclic number.

It is not a de Polignac number, because 621086401 - 2⁵ = 621086369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621086401.

It is not an unprimeable number, because it can be changed into a prime (621086461) 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, 23887926 + ... + 23887951.

It is an arithmetic number, because the mean of its divisors is an integer number (167215573).

Almost surely, 2^621086401 is an apocalyptic number.

It is an amenable number.

621086401 is a deficient number, since it is larger than the sum of its proper divisors (47775891).

621086401 is a wasteful number, since it uses less digits than its factorization.

621086401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47775890.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 621086401 is about 24921.6051048082. The cubic root of 621086401 is about 853.1996594235.

The spelling of 621086401 in words is "six hundred twenty-one million, eighty-six thousand, four hundred one".