55859981 has 4 divisors (see below), whose sum is σ = 58800000. Its totient is φ = 52919964.

The previous prime is 55859971. The next prime is 55859987. The reversal of 55859981 is 18995855.

55859981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18995855 = 5 ⋅3799171.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55859981 is a prime.

It is a super-2 number, since 2×55859981² = 6240674954640722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55859987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1469981 + ... + 1470018.

It is an arithmetic number, because the mean of its divisors is an integer number (14700000).

Almost surely, 2^55859981 is an apocalyptic number.

It is an amenable number.

55859981 is a deficient number, since it is larger than the sum of its proper divisors (2940019).

55859981 is a wasteful number, since it uses less digits than its factorization.

55859981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940018.

The product of its digits is 648000, while the sum is 50.

The square root of 55859981 is about 7473.9535053411. The cubic root of 55859981 is about 382.2671052952.

The spelling of 55859981 in words is "fifty-five million, eight hundred fifty-nine thousand, nine hundred eighty-one".