100561551 has 8 divisors (see below), whose sum is σ = 138407424. Its totient is φ = 64878360.

The previous prime is 100561507. The next prime is 100561553. The reversal of 100561551 is 155165001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100561551 - 2²² = 96367247 is a prime.

It is a super-2 number, since 2×100561551² = 20225251079051202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100561553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540561 + ... + 540746.

It is an arithmetic number, because the mean of its divisors is an integer number (17300928).

Almost surely, 2^100561551 is an apocalyptic number.

100561551 is a deficient number, since it is larger than the sum of its proper divisors (37845873).

100561551 is a wasteful number, since it uses less digits than its factorization.

100561551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081341.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 100561551 is about 10028.0382428469. The cubic root of 100561551 is about 465.0260917259.

The spelling of 100561551 in words is "one hundred million, five hundred sixty-one thousand, five hundred fifty-one".