55017251 has 4 divisors (see below), whose sum is σ = 55838472. Its totient is φ = 54196032.

The previous prime is 55017241. The next prime is 55017257. The reversal of 55017251 is 15271055.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15271055 = 5 ⋅3054211.

It is a de Polignac number, because none of the positive numbers 2^k-55017251 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 55017251.

It is not an unprimeable number, because it can be changed into a prime (55017257) 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, 410510 + ... + 410643.

It is an arithmetic number, because the mean of its divisors is an integer number (13959618).

Almost surely, 2^55017251 is an apocalyptic number.

55017251 is a deficient number, since it is larger than the sum of its proper divisors (821221).

55017251 is an equidigital number, since it uses as much as digits as its factorization.

55017251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821220.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 55017251 is about 7417.3614580928. The cubic root of 55017251 is about 380.3350023640.

The spelling of 55017251 in words is "fifty-five million, seventeen thousand, two hundred fifty-one".