55961839 has 4 divisors (see below), whose sum is σ = 56131240. Its totient is φ = 55792440.

The previous prime is 55961833. The next prime is 55961863. The reversal of 55961839 is 93816955.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93816955 = 5 ⋅18763391.

It is a cyclic number.

It is not a de Polignac number, because 55961839 - 2³ = 55961831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55961831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84204 + ... + 84865.

It is an arithmetic number, because the mean of its divisors is an integer number (14032810).

Almost surely, 2^55961839 is an apocalyptic number.

55961839 is a deficient number, since it is larger than the sum of its proper divisors (169401).

55961839 is a wasteful number, since it uses less digits than its factorization.

55961839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169400.

The product of its digits is 291600, while the sum is 46.

The square root of 55961839 is about 7480.7645999590. The cubic root of 55961839 is about 382.4993127987.

The spelling of 55961839 in words is "fifty-five million, nine hundred sixty-one thousand, eight hundred thirty-nine".