2398181 has 2 divisors, whose sum is σ = 2398182. Its totient is φ = 2398180.

The previous prime is 2398177. The next prime is 2398183. The reversal of 2398181 is 1818932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1416100 + 982081 = 1190^2 + 991^2 .

It is a cyclic number.

It is not a de Polignac number, because 2398181 - 2² = 2398177 is a prime.

It is a super-2 number, since 2×2398181² = 11502544217522, which contains 22 as substring.

Together with 2398183, 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 (2398183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1199090 + 1199091.

It is an arithmetic number, because the mean of its divisors is an integer number (1199091).

2^2398181 is an apocalyptic number.

It is an amenable number.

2398181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2398181 is an equidigital number, since it uses as much as digits as its factorization.

2398181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 2398181 is about 1548.6061474759. The cubic root of 2398181 is about 133.8527565080.

The spelling of 2398181 in words is "two million, three hundred ninety-eight thousand, one hundred eighty-one".