55420251 has 8 divisors (see below), whose sum is σ = 74182224. Its totient is φ = 36802560.

The previous prime is 55420241. The next prime is 55420259. The reversal of 55420251 is 15202455.

It is a happy number.

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

It is not a de Polignac number, because 55420251 - 2⁹ = 55419739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55420259) 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, 35170 + ... + 36711.

It is an arithmetic number, because the mean of its divisors is an integer number (9272778).

Almost surely, 2^55420251 is an apocalyptic number.

55420251 is a deficient number, since it is larger than the sum of its proper divisors (18761973).

55420251 is a wasteful number, since it uses less digits than its factorization.

55420251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72141.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 55420251 is about 7444.4778863262. The cubic root of 55420251 is about 381.2613922601.

The spelling of 55420251 in words is "fifty-five million, four hundred twenty thousand, two hundred fifty-one".