621186481 has 4 divisors (see below), whose sum is σ = 621310464. Its totient is φ = 621062500.

The previous prime is 621186473. The next prime is 621186487. The reversal of 621186481 is 184681126.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 621186481 - 2³ = 621186473 is a prime.

It is a super-2 number, since 2×621186481² = 771745288354326722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621186481.

It is not an unprimeable number, because it can be changed into a prime (621186487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54145 + ... + 64606.

It is an arithmetic number, because the mean of its divisors is an integer number (155327616).

Almost surely, 2^621186481 is an apocalyptic number.

It is an amenable number.

621186481 is a deficient number, since it is larger than the sum of its proper divisors (123983).

621186481 is a wasteful number, since it uses less digits than its factorization.

621186481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123982.

The product of its digits is 18432, while the sum is 37.

The square root of 621186481 is about 24923.6129202810. The cubic root of 621186481 is about 853.2454843070.

The spelling of 621186481 in words is "six hundred twenty-one million, one hundred eighty-six thousand, four hundred eighty-one".