621732091 has 2 divisors, whose sum is σ = 621732092. Its totient is φ = 621732090.

The previous prime is 621732043. The next prime is 621732101. The reversal of 621732091 is 190237126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621732091 - 2⁷ = 621731963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (621732031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310866045 + 310866046.

It is an arithmetic number, because the mean of its divisors is an integer number (310866046).

Almost surely, 2^621732091 is an apocalyptic number.

621732091 is a deficient number, since it is larger than the sum of its proper divisors (1).

621732091 is an equidigital number, since it uses as much as digits as its factorization.

621732091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 621732091 is about 24934.5561620816. The cubic root of 621732091 is about 853.4952230728.

The spelling of 621732091 in words is "six hundred twenty-one million, seven hundred thirty-two thousand, ninety-one".