621650105 has 8 divisors (see below), whose sum is σ = 749846472. Its totient is φ = 494742528.

The previous prime is 621650093. The next prime is 621650129. The reversal of 621650105 is 501056126.

It can be written as a sum of positive squares in 4 ways, for example, as 23309584 + 598340521 = 4828^2 + 24461^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621650105 - 2⁴ = 621650089 is a prime.

It is a super-2 number, since 2×621650105² = 772897706093022050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 321134 + ... + 323063.

It is an arithmetic number, because the mean of its divisors is an integer number (93730809).

Almost surely, 2^621650105 is an apocalyptic number.

It is an amenable number.

621650105 is a deficient number, since it is larger than the sum of its proper divisors (128196367).

621650105 is a wasteful number, since it uses less digits than its factorization.

621650105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644395.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 621650105 is about 24932.9120842312. The cubic root of 621650105 is about 853.4577054472.

The spelling of 621650105 in words is "six hundred twenty-one million, six hundred fifty thousand, one hundred five".