621252561 has 8 divisors (see below), whose sum is σ = 828733984. Its totient is φ = 413969760.

The previous prime is 621252509. The next prime is 621252581. The reversal of 621252561 is 165252126.

621252561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 621252561 - 2¹⁷ = 621121489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621252581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42196 + ... + 54981.

It is an arithmetic number, because the mean of its divisors is an integer number (103591748).

Almost surely, 2^621252561 is an apocalyptic number.

It is an amenable number.

621252561 is a deficient number, since it is larger than the sum of its proper divisors (207481423).

621252561 is a wasteful number, since it uses less digits than its factorization.

621252561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99311.

The product of its digits is 7200, while the sum is 30.

The square root of 621252561 is about 24924.9385355310. The cubic root of 621252561 is about 853.2757384868.

The spelling of 621252561 in words is "six hundred twenty-one million, two hundred fifty-two thousand, five hundred sixty-one".