100551 has 12 divisors (see below), whose sum is σ = 147896. Its totient is φ = 60720.

The previous prime is 100549. The next prime is 100559. The reversal of 100551 is 155001.

It is not a de Polignac number, because 100551 - 2¹ = 100549 is a prime.

It is a super-2 number, since 2×100551² = 20221007202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225 + ... + 501.

2¹⁰⁰⁵⁵¹ is an apocalyptic number.

100551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

100551 is a deficient number, since it is larger than the sum of its proper divisors (47345).

100551 is a wasteful number, since it uses less digits than its factorization.

100551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 12.

The square root of 100551 is about 317.0977767188. The cubic root of 100551 is about 46.5009827518.

Adding to 100551 its product of nonzero digits (25), we get a triangular number (100576 = T₄₄₈).

Adding to 100551 its reverse (155001), we get a palindrome (255552).

The spelling of 100551 in words is "one hundred thousand, five hundred fifty-one".