55257487 has 2 divisors, whose sum is σ = 55257488. Its totient is φ = 55257486.

The previous prime is 55257473. The next prime is 55257493. The reversal of 55257487 is 78475255.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55257487 - 2⁷ = 55257359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55257427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27628743 + 27628744.

It is an arithmetic number, because the mean of its divisors is an integer number (27628744).

Almost surely, 2^55257487 is an apocalyptic number.

55257487 is a deficient number, since it is larger than the sum of its proper divisors (1).

55257487 is an equidigital number, since it uses as much as digits as its factorization.

55257487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 392000, while the sum is 43.

The square root of 55257487 is about 7433.5379867194. The cubic root of 55257487 is about 380.8877834683.

The spelling of 55257487 in words is "fifty-five million, two hundred fifty-seven thousand, four hundred eighty-seven".