100009551 has 4 divisors (see below), whose sum is σ = 133346072. Its totient is φ = 66673032.

The previous prime is 100009549. The next prime is 100009573. The reversal of 100009551 is 155900001.

It is a happy number.

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

It is not a de Polignac number, because 100009551 - 2¹ = 100009549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100009501) 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, 16668256 + ... + 16668261.

It is an arithmetic number, because the mean of its divisors is an integer number (33336518).

Almost surely, 2^100009551 is an apocalyptic number.

100009551 is a deficient number, since it is larger than the sum of its proper divisors (33336521).

100009551 is an equidigital number, since it uses as much as digits as its factorization.

100009551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33336520.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 100009551 is about 10000.4775385978. The cubic root of 100009551 is about 464.1736601625.

Adding to 100009551 its reverse (155900001), we get a palindrome (255909552).

The spelling of 100009551 in words is "one hundred million, nine thousand, five hundred fifty-one".