621339639001 has 9 divisors (see below), whose sum is σ = 628982081311. Its totient is φ = 613788982672.

The previous prime is 621339638989. The next prime is 621339639023. The reversal of 621339639001 is 100936933126.

The square root of 621339639001 is 788251.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 29092419225 + 592247219776 = 170565^2 + 769576^2 .

It is not a de Polignac number, because 621339639001 - 2²¹ = 621337541849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621339639071) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 65420085 + ... + 65429581.

Almost surely, 2^621339639001 is an apocalyptic number.

621339639001 is the 788251-st square number.

621339639001 is the 394126-th centered octagonal number.

It is an amenable number.

621339639001 is a deficient number, since it is larger than the sum of its proper divisors (7642442310).

621339639001 is an frugal number, since it uses more digits than its factorization.

621339639001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19160 (or 9580 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 43.

The spelling of 621339639001 in words is "six hundred twenty-one billion, three hundred thirty-nine million, six hundred thirty-nine thousand, one".