55242251 has 8 divisors (see below), whose sum is σ = 58375680. Its totient is φ = 52169832.

The previous prime is 55242247. The next prime is 55242259. The reversal of 55242251 is 15224255.

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 55242251 - 2² = 55242247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55242251.

It is not an unprimeable number, because it can be changed into a prime (55242259) 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, 13385 + ... + 17018.

It is an arithmetic number, because the mean of its divisors is an integer number (7296960).

Almost surely, 2^55242251 is an apocalyptic number.

55242251 is a deficient number, since it is larger than the sum of its proper divisors (3133429).

55242251 is a wasteful number, since it uses less digits than its factorization.

55242251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30505.

The product of its digits is 4000, while the sum is 26.

The square root of 55242251 is about 7432.5131012330. The cubic root of 55242251 is about 380.8527731917.

The spelling of 55242251 in words is "fifty-five million, two hundred forty-two thousand, two hundred fifty-one".