55431947 has 2 divisors, whose sum is σ = 55431948. Its totient is φ = 55431946.

The previous prime is 55431923. The next prime is 55431953. The reversal of 55431947 is 74913455.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55431947 - 2²⁴ = 38654731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55431947.

It is not a weakly prime, because it can be changed into another prime (55431907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27715973 + 27715974.

It is an arithmetic number, because the mean of its divisors is an integer number (27715974).

Almost surely, 2^55431947 is an apocalyptic number.

55431947 is a deficient number, since it is larger than the sum of its proper divisors (1).

55431947 is an equidigital number, since it uses as much as digits as its factorization.

55431947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 55431947 is about 7445.2633935946. The cubic root of 55431947 is about 381.2882110944.

The spelling of 55431947 in words is "fifty-five million, four hundred thirty-one thousand, nine hundred forty-seven".