621352561 has 8 divisors (see below), whose sum is σ = 642152448. Its totient is φ = 600600000.

The previous prime is 621352553. The next prime is 621352591. The reversal of 621352561 is 165253126.

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 621352561 - 2³ = 621352553 is a prime.

It is a super-2 number, since 2×621352561² = 772158010122517442, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621352591) 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, 15936 + ... + 38686.

It is an arithmetic number, because the mean of its divisors is an integer number (80269056).

Almost surely, 2^621352561 is an apocalyptic number.

It is an amenable number.

621352561 is a deficient number, since it is larger than the sum of its proper divisors (20799887).

621352561 is a wasteful number, since it uses less digits than its factorization.

621352561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23663.

The product of its digits is 10800, while the sum is 31.

The square root of 621352561 is about 24926.9444778136. The cubic root of 621352561 is about 853.3215185776.

The spelling of 621352561 in words is "six hundred twenty-one million, three hundred fifty-two thousand, five hundred sixty-one".