55979961 has 16 divisors (see below), whose sum is σ = 77032704. Its totient is φ = 36140544.

The previous prime is 55979951. The next prime is 55979969. The reversal of 55979961 is 16997955.

It is a happy number.

It is not a de Polignac number, because 55979961 - 2⁶ = 55979897 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 11631 + ... + 15723.

It is an arithmetic number, because the mean of its divisors is an integer number (4814544).

Almost surely, 2^55979961 is an apocalyptic number.

It is an amenable number.

55979961 is a deficient number, since it is larger than the sum of its proper divisors (21052743).

55979961 is a wasteful number, since it uses less digits than its factorization.

55979961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240.

The product of its digits is 765450, while the sum is 51.

The square root of 55979961 is about 7481.9757417409. The cubic root of 55979961 is about 382.5405963149.

The spelling of 55979961 in words is "fifty-five million, nine hundred seventy-nine thousand, nine hundred sixty-one".