55287251 has 2 divisors, whose sum is σ = 55287252. Its totient is φ = 55287250.

The previous prime is 55287227. The next prime is 55287259. The reversal of 55287251 is 15278255.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55287251 - 2²² = 51092947 is a prime.

It is equal to p_3298337 and since 55287251 and 3298337 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (55287259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27643625 + 27643626.

It is an arithmetic number, because the mean of its divisors is an integer number (27643626).

Almost surely, 2^55287251 is an apocalyptic number.

55287251 is a deficient number, since it is larger than the sum of its proper divisors (1).

55287251 is an equidigital number, since it uses as much as digits as its factorization.

55287251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28000, while the sum is 35.

The square root of 55287251 is about 7435.5397248619. The cubic root of 55287251 is about 380.9561585714.

The spelling of 55287251 in words is "fifty-five million, two hundred eighty-seven thousand, two hundred fifty-one".