55157181 has 4 divisors (see below), whose sum is σ = 73542912. Its totient is φ = 36771452.

The previous prime is 55157117. The next prime is 55157189. The reversal of 55157181 is 18175155.

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 55157181 - 2⁶ = 55157117 is a prime.

It is a super-2 number, since 2×55157181² = 6084629231733522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55157189) 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, 9192861 + ... + 9192866.

It is an arithmetic number, because the mean of its divisors is an integer number (18385728).

Almost surely, 2^55157181 is an apocalyptic number.

It is an amenable number.

55157181 is a deficient number, since it is larger than the sum of its proper divisors (18385731).

55157181 is a wasteful number, since it uses less digits than its factorization.

55157181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18385730.

The product of its digits is 7000, while the sum is 33.

The square root of 55157181 is about 7426.7880675296. The cubic root of 55157181 is about 380.6571753776.

The spelling of 55157181 in words is "fifty-five million, one hundred fifty-seven thousand, one hundred eighty-one".