100165521 has 4 divisors (see below), whose sum is σ = 133554032. Its totient is φ = 66777012.

The previous prime is 100165489. The next prime is 100165523. The reversal of 100165521 is 125561001.

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 not a de Polignac number, because 100165521 - 2⁵ = 100165489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100165523) 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, 16694251 + ... + 16694256.

It is an arithmetic number, because the mean of its divisors is an integer number (33388508).

Almost surely, 2^100165521 is an apocalyptic number.

It is an amenable number.

100165521 is a deficient number, since it is larger than the sum of its proper divisors (33388511).

100165521 is an equidigital number, since it uses as much as digits as its factorization.

100165521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33388510.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 100165521 is about 10008.2726281811. The cubic root of 100165521 is about 464.4148356700.

The spelling of 100165521 in words is "one hundred million, one hundred sixty-five thousand, five hundred twenty-one".