55457279 has 2 divisors, whose sum is σ = 55457280. Its totient is φ = 55457278.

The previous prime is 55457249. The next prime is 55457291. The reversal of 55457279 is 97275455.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55457279 - 2⁸ = 55457023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55457249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27728639 + 27728640.

It is an arithmetic number, because the mean of its divisors is an integer number (27728640).

Almost surely, 2^55457279 is an apocalyptic number.

55457279 is a deficient number, since it is larger than the sum of its proper divisors (1).

55457279 is an equidigital number, since it uses as much as digits as its factorization.

55457279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 441000, while the sum is 44.

The square root of 55457279 is about 7446.9644151157. The cubic root of 55457279 is about 381.3462842365.

The spelling of 55457279 in words is "fifty-five million, four hundred fifty-seven thousand, two hundred seventy-nine".