55550551 has 8 divisors (see below), whose sum is σ = 63669024. Its totient is φ = 47477760.

The previous prime is 55550527. The next prime is 55550557. The reversal of 55550551 is 15505555.

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

It is a cyclic number.

It is not a de Polignac number, because 55550551 - 2⁷ = 55550423 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 (55550557) 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, 8770 + ... + 13711.

It is an arithmetic number, because the mean of its divisors is an integer number (7958628).

Almost surely, 2^55550551 is an apocalyptic number.

55550551 is a deficient number, since it is larger than the sum of its proper divisors (8118473).

55550551 is a wasteful number, since it uses less digits than its factorization.

55550551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22841.

The product of its (nonzero) digits is 15625, while the sum is 31.

The square root of 55550551 is about 7453.2242016459. The cubic root of 55550551 is about 381.5599562683.

The spelling of 55550551 in words is "fifty-five million, five hundred fifty thousand, five hundred fifty-one".