55979919 has 6 divisors (see below), whose sum is σ = 80859896. Its totient is φ = 37319940.

The previous prime is 55979899. The next prime is 55979933. The reversal of 55979919 is 91997955.

55979919 is a `hidden beast` number, since 559 + 79 + 9 + 19 = 666.

It is not a de Polignac number, because 55979919 - 2¹¹ = 55977871 is a prime.

It is a super-2 number, since 2×55979919² = 6267502662493122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55979969) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3109987 + ... + 3110004.

Almost surely, 2^55979919 is an apocalyptic number.

55979919 is a deficient number, since it is larger than the sum of its proper divisors (24879977).

55979919 is a wasteful number, since it uses less digits than its factorization.

55979919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6219997 (or 6219994 counting only the distinct ones).

The product of its digits is 1148175, while the sum is 54.

The square root of 55979919 is about 7481.9729349952. The cubic root of 55979919 is about 382.5405006455.

The spelling of 55979919 in words is "fifty-five million, nine hundred seventy-nine thousand, nine hundred nineteen".