55720149 has 4 divisors (see below), whose sum is σ = 74293536. Its totient is φ = 37146764.

The previous prime is 55720123. The next prime is 55720151. The reversal of 55720149 is 94102755.

55720149 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.

It is a cyclic number.

It is not a de Polignac number, because 55720149 - 2⁵ = 55720117 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55720109) 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, 9286689 + ... + 9286694.

It is an arithmetic number, because the mean of its divisors is an integer number (18573384).

Almost surely, 2^55720149 is an apocalyptic number.

It is an amenable number.

55720149 is a deficient number, since it is larger than the sum of its proper divisors (18573387).

55720149 is a wasteful number, since it uses less digits than its factorization.

55720149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18573386.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 55720149 is about 7464.5930230656. The cubic root of 55720149 is about 381.9478675785.

It can be divided in two parts, 557 and 20149, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 55720149 in words is "fifty-five million, seven hundred twenty thousand, one hundred forty-nine".