55870181 has 2 divisors, whose sum is σ = 55870182. Its totient is φ = 55870180.

The previous prime is 55870163. The next prime is 55870183. The reversal of 55870181 is 18107855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38019556 + 17850625 = 6166^2 + 4225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55870181 is a prime.

It is a super-3 number, since 3×55870181³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 55870183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55870183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27935090 + 27935091.

It is an arithmetic number, because the mean of its divisors is an integer number (27935091).

Almost surely, 2^55870181 is an apocalyptic number.

It is an amenable number.

55870181 is a deficient number, since it is larger than the sum of its proper divisors (1).

55870181 is an equidigital number, since it uses as much as digits as its factorization.

55870181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 55870181 is about 7474.6358439726. The cubic root of 55870181 is about 382.2903711294.

The spelling of 55870181 in words is "fifty-five million, eight hundred seventy thousand, one hundred eighty-one".