100645521 has 4 divisors (see below), whose sum is σ = 134194032. Its totient is φ = 67097012.

The previous prime is 100645507. The next prime is 100645537. The reversal of 100645521 is 125546001.

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.

It is a cyclic number.

It is not a de Polignac number, because 100645521 - 2⁹ = 100645009 is a prime.

It is a super-2 number, since 2×100645521² = 20259041794722882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 100645491 and 100645500.

It is not an unprimeable number, because it can be changed into a prime (100645541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16774251 + ... + 16774256.

It is an arithmetic number, because the mean of its divisors is an integer number (33548508).

Almost surely, 2^100645521 is an apocalyptic number.

It is an amenable number.

100645521 is a deficient number, since it is larger than the sum of its proper divisors (33548511).

100645521 is an equidigital number, since it uses as much as digits as its factorization.

100645521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33548510.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 100645521 is about 10032.2241302714. The cubic root of 100645521 is about 465.1554896817.

The spelling of 100645521 in words is "one hundred million, six hundred forty-five thousand, five hundred twenty-one".