621163801 has 2 divisors, whose sum is σ = 621163802. Its totient is φ = 621163800.

The previous prime is 621163769. The next prime is 621163849. The reversal of 621163801 is 108361126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 615288025 + 5875776 = 24805^2 + 2424^2 .

It is a cyclic number.

It is not a de Polignac number, because 621163801 - 2⁵ = 621163769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621163801.

It is not a weakly prime, because it can be changed into another prime (621163871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310581900 + 310581901.

It is an arithmetic number, because the mean of its divisors is an integer number (310581901).

Almost surely, 2^621163801 is an apocalyptic number.

It is an amenable number.

621163801 is a deficient number, since it is larger than the sum of its proper divisors (1).

621163801 is an equidigital number, since it uses as much as digits as its factorization.

621163801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 621163801 is about 24923.1579259130. The cubic root of 621163801 is about 853.2350999626.

The spelling of 621163801 in words is "six hundred twenty-one million, one hundred sixty-three thousand, eight hundred one".