55497947 has 2 divisors, whose sum is σ = 55497948. Its totient is φ = 55497946.

The previous prime is 55497899. The next prime is 55497971. The reversal of 55497947 is 74979455.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55497947 - 2⁸ = 55497691 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55497895 and 55497904.

It is not a weakly prime, because it can be changed into another prime (55497847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27748973 + 27748974.

It is an arithmetic number, because the mean of its divisors is an integer number (27748974).

Almost surely, 2^55497947 is an apocalyptic number.

55497947 is a deficient number, since it is larger than the sum of its proper divisors (1).

55497947 is an equidigital number, since it uses as much as digits as its factorization.

55497947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1587600, while the sum is 50.

The square root of 55497947 is about 7449.6944232633. The cubic root of 55497947 is about 381.4394779019.

The spelling of 55497947 in words is "fifty-five million, four hundred ninety-seven thousand, nine hundred forty-seven".