55547979 has 4 divisors (see below), whose sum is σ = 74063976. Its totient is φ = 37031984.

The previous prime is 55547977. The next prime is 55548007. The reversal of 55547979 is 97974555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55547979 - 2¹ = 55547977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55547977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9257994 + ... + 9257999.

It is an arithmetic number, because the mean of its divisors is an integer number (18515994).

Almost surely, 2^55547979 is an apocalyptic number.

55547979 is a deficient number, since it is larger than the sum of its proper divisors (18515997).

55547979 is a wasteful number, since it uses less digits than its factorization.

55547979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18515996.

The product of its digits is 1984500, while the sum is 51.

The square root of 55547979 is about 7453.0516568718. The cubic root of 55547979 is about 381.5540674137.

The spelling of 55547979 in words is "fifty-five million, five hundred forty-seven thousand, nine hundred seventy-nine".