621994159 has 2 divisors, whose sum is σ = 621994160. Its totient is φ = 621994158.

The previous prime is 621994133. The next prime is 621994189. The reversal of 621994159 is 951499126.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621994159 - 2¹⁷ = 621863087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621994189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310997079 + 310997080.

It is an arithmetic number, because the mean of its divisors is an integer number (310997080).

Almost surely, 2^621994159 is an apocalyptic number.

621994159 is a deficient number, since it is larger than the sum of its proper divisors (1).

621994159 is an equidigital number, since it uses as much as digits as its factorization.

621994159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 46.

The square root of 621994159 is about 24939.8107250236. The cubic root of 621994159 is about 853.6151259321.

The spelling of 621994159 in words is "six hundred twenty-one million, nine hundred ninety-four thousand, one hundred fifty-nine".