55555547 has 2 divisors, whose sum is σ = 55555548. Its totient is φ = 55555546.

The previous prime is 55555543. The next prime is 55555553. The reversal of 55555547 is 74555555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55555547 - 2² = 55555543 is a prime.

It is not a weakly prime, because it can be changed into another prime (55555543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27777773 + 27777774.

It is an arithmetic number, because the mean of its divisors is an integer number (27777774).

Almost surely, 2^55555547 is an apocalyptic number.

55555547 is a deficient number, since it is larger than the sum of its proper divisors (1).

55555547 is an equidigital number, since it uses as much as digits as its factorization.

55555547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 437500, while the sum is 41.

The square root of 55555547 is about 7453.5593510752. The cubic root of 55555547 is about 381.5713945971.

The spelling of 55555547 in words is "fifty-five million, five hundred fifty-five thousand, five hundred forty-seven".