100655621 has 8 divisors (see below), whose sum is σ = 110051904. Its totient is φ = 91300320.

The previous prime is 100655603. The next prime is 100655629. The reversal of 100655621 is 126556001.

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 100655621 - 2⁶ = 100655557 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 (100655629) 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, 4985 + ... + 15038.

It is an arithmetic number, because the mean of its divisors is an integer number (13756488).

Almost surely, 2^100655621 is an apocalyptic number.

100655621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100655621 is a deficient number, since it is larger than the sum of its proper divisors (9396283).

100655621 is a wasteful number, since it uses less digits than its factorization.

100655621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20491.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 100655621 is about 10032.7274955517. The cubic root of 100655621 is about 465.1710489543.

The spelling of 100655621 in words is "one hundred million, six hundred fifty-five thousand, six hundred twenty-one".