100550551 has 4 divisors (see below), whose sum is σ = 100572112. Its totient is φ = 100528992.

The previous prime is 100550543. The next prime is 100550561. The reversal of 100550551 is 155055001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100550551 - 2³ = 100550543 is a prime.

It is a super-2 number, since 2×100550551² = 20220826612807202, 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 (100550501) 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, 546 + ... + 14191.

It is an arithmetic number, because the mean of its divisors is an integer number (25143028).

Almost surely, 2^100550551 is an apocalyptic number.

100550551 is a deficient number, since it is larger than the sum of its proper divisors (21561).

100550551 is an equidigital number, since it uses as much as digits as its factorization.

100550551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21560.

The product of its (nonzero) digits is 625, while the sum is 22.

The square root of 100550551 is about 10027.4897656393. The cubic root of 100550551 is about 465.0091353661.

Multiplying 100550551 by its sum of digits (22), we get a palindrome (2212112122).

It can be divided in two parts, 100550 and 551, that added together give a palindrome (101101).

The spelling of 100550551 in words is "one hundred million, five hundred fifty thousand, five hundred fifty-one".