55172261 has 4 divisors (see below), whose sum is σ = 55212300. Its totient is φ = 55132224.

The previous prime is 55172233. The next prime is 55172267. The reversal of 55172261 is 16227155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8850625 + 46321636 = 2975^2 + 6806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55172261 is a prime.

It is a pancake number, because a pancake can be divided into 55172261 parts by 10504 straight cuts.

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 (55172267) 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, 17876 + ... + 20733.

It is an arithmetic number, because the mean of its divisors is an integer number (13803075).

Almost surely, 2^55172261 is an apocalyptic number.

It is an amenable number.

55172261 is a deficient number, since it is larger than the sum of its proper divisors (40039).

55172261 is a wasteful number, since it uses less digits than its factorization.

55172261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40038.

The product of its digits is 4200, while the sum is 29.

The square root of 55172261 is about 7427.8032418744. The cubic root of 55172261 is about 380.6918628353.

The spelling of 55172261 in words is "fifty-five million, one hundred seventy-two thousand, two hundred sixty-one".