55959557 has 4 divisors (see below), whose sum is σ = 57764736. Its totient is φ = 54154380.

The previous prime is 55959511. The next prime is 55959559. The reversal of 55959557 is 75595955.

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: 75595955 = 5 ⋅15119191.

It is a cyclic number.

It is not a de Polignac number, because 55959557 - 2⁶ = 55959493 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 (55959559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 902543 + ... + 902604.

It is an arithmetic number, because the mean of its divisors is an integer number (14441184).

Almost surely, 2^55959557 is an apocalyptic number.

It is an amenable number.

55959557 is a deficient number, since it is larger than the sum of its proper divisors (1805179).

55959557 is a wasteful number, since it uses less digits than its factorization.

55959557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1805178.

The product of its digits is 1771875, while the sum is 50.

The square root of 55959557 is about 7480.6120738881. The cubic root of 55959557 is about 382.4941135694.

The spelling of 55959557 in words is "fifty-five million, nine hundred fifty-nine thousand, five hundred fifty-seven".