55851247 has 2 divisors, whose sum is σ = 55851248. Its totient is φ = 55851246.

The previous prime is 55851209. The next prime is 55851253. The reversal of 55851247 is 74215855.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55851247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55851287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27925623 + 27925624.

It is an arithmetic number, because the mean of its divisors is an integer number (27925624).

Almost surely, 2^55851247 is an apocalyptic number.

55851247 is a deficient number, since it is larger than the sum of its proper divisors (1).

55851247 is an equidigital number, since it uses as much as digits as its factorization.

55851247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56000, while the sum is 37.

The square root of 55851247 is about 7473.3691866520. The cubic root of 55851247 is about 382.2471811034.

The spelling of 55851247 in words is "fifty-five million, eight hundred fifty-one thousand, two hundred forty-seven".