621250081 has 4 divisors (see below), whose sum is σ = 636402564. Its totient is φ = 606097600.

The previous prime is 621250031. The next prime is 621250211. The reversal of 621250081 is 180052126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63345681 + 557904400 = 7959^2 + 23620^2 .

It is a cyclic number.

It is not a de Polignac number, because 621250081 - 2¹⁹ = 620725793 is a prime.

It is a super-2 number, since 2×621250081² = 771903326285013122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621250031) 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 3 ways as a sum of consecutive naturals, for example, 7576180 + ... + 7576261.

It is an arithmetic number, because the mean of its divisors is an integer number (159100641).

Almost surely, 2^621250081 is an apocalyptic number.

It is an amenable number.

621250081 is a deficient number, since it is larger than the sum of its proper divisors (15152483).

621250081 is a wasteful number, since it uses less digits than its factorization.

621250081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15152482.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 621250081 is about 24924.8887861110. Note that the first 3 decimals coincide. The cubic root of 621250081 is about 853.2746030781.

The spelling of 621250081 in words is "six hundred twenty-one million, two hundred fifty thousand, eighty-one".