55997261 has 4 divisors (see below), whose sum is σ = 56014272. Its totient is φ = 55980252.

The previous prime is 55997251. The next prime is 55997297. The reversal of 55997261 is 16279955.

It is a happy number.

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: 16279955 = 5 ⋅3255991.

It is a cyclic number.

It is not a de Polignac number, because 55997261 - 2²² = 51802957 is a prime.

It is a Duffinian number.

55997261 is a Rhonda number in base 10.

Its product of digits (170100) is a multiple of the sum of its prime divisors (17010).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55997251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1811 + ... + 10736.

It is an arithmetic number, because the mean of its divisors is an integer number (14003568).

Almost surely, 2^55997261 is an apocalyptic number.

It is an amenable number.

55997261 is a deficient number, since it is larger than the sum of its proper divisors (17011).

55997261 is a wasteful number, since it uses less digits than its factorization.

55997261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17010.

The product of its digits is 170100, while the sum is 44.

The square root of 55997261 is about 7483.1317641747. The cubic root of 55997261 is about 382.5799989307.

The spelling of 55997261 in words is "fifty-five million, nine hundred ninety-seven thousand, two hundred sixty-one".