55040251 has 4 divisors (see below), whose sum is σ = 62903152. Its totient is φ = 47177352.

The previous prime is 55040233. The next prime is 55040261. The reversal of 55040251 is 15204055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15204055 = 5 ⋅3040811.

It is a cyclic number.

It is not a de Polignac number, because 55040251 - 2⁹ = 55039739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55040261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3931440 + ... + 3931453.

It is an arithmetic number, because the mean of its divisors is an integer number (15725788).

Almost surely, 2^55040251 is an apocalyptic number.

55040251 is a deficient number, since it is larger than the sum of its proper divisors (7862901).

55040251 is an equidigital number, since it uses as much as digits as its factorization.

55040251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7862900.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 55040251 is about 7418.9117126436. The cubic root of 55040251 is about 380.3879947509.

The spelling of 55040251 in words is "fifty-five million, forty thousand, two hundred fifty-one".