621100013 has 2 divisors, whose sum is σ = 621100014. Its totient is φ = 621100012.

The previous prime is 621100001. The next prime is 621100033. The reversal of 621100013 is 310001126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 592338244 + 28761769 = 24338^2 + 5363^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621100013 is a prime.

It is a super-2 number, since 2×621100013² = 771530452297200338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621100033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310550006 + 310550007.

It is an arithmetic number, because the mean of its divisors is an integer number (310550007).

Almost surely, 2^621100013 is an apocalyptic number.

It is an amenable number.

621100013 is a deficient number, since it is larger than the sum of its proper divisors (1).

621100013 is an equidigital number, since it uses as much as digits as its factorization.

621100013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 621100013 is about 24921.8781996863. The cubic root of 621100013 is about 853.2058924097.

Adding to 621100013 its reverse (310001126), we get a palindrome (931101139).

The spelling of 621100013 in words is "six hundred twenty-one million, one hundred thousand, thirteen".