55397647 has 2 divisors, whose sum is σ = 55397648. Its totient is φ = 55397646.

The previous prime is 55397609. The next prime is 55397659. The reversal of 55397647 is 74679355.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55397647 - 2¹⁹ = 54873359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55397597 and 55397606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55397687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27698823 + 27698824.

It is an arithmetic number, because the mean of its divisors is an integer number (27698824).

Almost surely, 2^55397647 is an apocalyptic number.

55397647 is a deficient number, since it is larger than the sum of its proper divisors (1).

55397647 is an equidigital number, since it uses as much as digits as its factorization.

55397647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 46.

The square root of 55397647 is about 7442.9595592076. The cubic root of 55397647 is about 381.2095507745.

The spelling of 55397647 in words is "fifty-five million, three hundred ninety-seven thousand, six hundred forty-seven".