100644551 has 16 divisors (see below), whose sum is σ = 118516224. Its totient is φ = 83661984.

The previous prime is 100644497. The next prime is 100644601. The reversal of 100644551 is 155446001.

It is not a de Polignac number, because 100644551 - 2¹⁰ = 100643527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100644551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100644751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135086 + ... + 135828.

It is an arithmetic number, because the mean of its divisors is an integer number (7407264).

Almost surely, 2^100644551 is an apocalyptic number.

100644551 is a deficient number, since it is larger than the sum of its proper divisors (17871673).

100644551 is an equidigital number, since it uses as much as digits as its factorization.

100644551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 100644551 is about 10032.1757859400. The cubic root of 100644551 is about 465.1539953205.

The spelling of 100644551 in words is "one hundred million, six hundred forty-four thousand, five hundred fifty-one".