100618621 has 4 divisors (see below), whose sum is σ = 101019744. Its totient is φ = 100217500.

The previous prime is 100618613. The next prime is 100618649. The reversal of 100618621 is 126816001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 126816001 = 13 ⋅9755077.

It is a cyclic number.

It is not a de Polignac number, because 100618621 - 2³ = 100618613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100612621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200185 + ... + 200686.

It is an arithmetic number, because the mean of its divisors is an integer number (25254936).

Almost surely, 2^100618621 is an apocalyptic number.

It is an amenable number.

100618621 is a deficient number, since it is larger than the sum of its proper divisors (401123).

100618621 is an equidigital number, since it uses as much as digits as its factorization.

100618621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401122.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 100618621 is about 10030.8833609010. The cubic root of 100618621 is about 465.1140445599.

The spelling of 100618621 in words is "one hundred million, six hundred eighteen thousand, six hundred twenty-one".