55143247 has 2 divisors, whose sum is σ = 55143248. Its totient is φ = 55143246.

The previous prime is 55143241. The next prime is 55143281. The reversal of 55143247 is 74234155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55143247 - 2⁷ = 55143119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55143241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27571623 + 27571624.

It is an arithmetic number, because the mean of its divisors is an integer number (27571624).

Almost surely, 2^55143247 is an apocalyptic number.

55143247 is a deficient number, since it is larger than the sum of its proper divisors (1).

55143247 is an equidigital number, since it uses as much as digits as its factorization.

55143247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 31.

The square root of 55143247 is about 7425.8499176862. The cubic root of 55143247 is about 380.6251183623.

The spelling of 55143247 in words is "fifty-five million, one hundred forty-three thousand, two hundred forty-seven".