621163849 has 2 divisors, whose sum is σ = 621163850. Its totient is φ = 621163848.

The previous prime is 621163801. The next prime is 621163871. The reversal of 621163849 is 948361126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 602948025 + 18215824 = 24555^2 + 4268^2 .

It is a cyclic number.

It is not a de Polignac number, because 621163849 - 2¹⁷ = 621032777 is a prime.

It is not a weakly prime, because it can be changed into another prime (621163889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310581924 + 310581925.

It is an arithmetic number, because the mean of its divisors is an integer number (310581925).

Almost surely, 2^621163849 is an apocalyptic number.

It is an amenable number.

621163849 is a deficient number, since it is larger than the sum of its proper divisors (1).

621163849 is an equidigital number, since it uses as much as digits as its factorization.

621163849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 621163849 is about 24923.1588888728. The cubic root of 621163849 is about 853.2351219403.

The spelling of 621163849 in words is "six hundred twenty-one million, one hundred sixty-three thousand, eight hundred forty-nine".