55297181 has 4 divisors (see below), whose sum is σ = 55319100. Its totient is φ = 55275264.

The previous prime is 55297169. The next prime is 55297189. The reversal of 55297181 is 18179255.

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 47265625 + 8031556 = 6875^2 + 2834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55297181 is a prime.

It is a super-2 number, since 2×55297181² = 6115556453093522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55297189) 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, 6596 + ... + 12413.

It is an arithmetic number, because the mean of its divisors is an integer number (13829775).

Almost surely, 2^55297181 is an apocalyptic number.

It is an amenable number.

55297181 is a deficient number, since it is larger than the sum of its proper divisors (21919).

55297181 is a wasteful number, since it uses less digits than its factorization.

55297181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21918.

The product of its digits is 25200, while the sum is 38.

The square root of 55297181 is about 7436.2074339007. The cubic root of 55297181 is about 380.9789647225.

The spelling of 55297181 in words is "fifty-five million, two hundred ninety-seven thousand, one hundred eighty-one".