621481091 has 32 divisors (see below), whose sum is σ = 816611328. Its totient is φ = 458583840.

The previous prime is 621481067. The next prime is 621481097. The reversal of 621481091 is 190184126.

It is not a de Polignac number, because 621481091 - 2⁶ = 621481027 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621481097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 180710 + ... + 184116.

It is an arithmetic number, because the mean of its divisors is an integer number (25519104).

Almost surely, 2^621481091 is an apocalyptic number.

621481091 is a deficient number, since it is larger than the sum of its proper divisors (195130237).

621481091 is a wasteful number, since it uses less digits than its factorization.

621481091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3551.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 621481091 is about 24929.5224783789. The cubic root of 621481091 is about 853.3803525151.

The spelling of 621481091 in words is "six hundred twenty-one million, four hundred eighty-one thousand, ninety-one".