249748189 has 2 divisors, whose sum is σ = 249748190. Its totient is φ = 249748188.

The previous prime is 249748159. The next prime is 249748199. The reversal of 249748189 is 981847942.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183602500 + 66145689 = 13550^2 + 8133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249748189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249748159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124874094 + 124874095.

It is an arithmetic number, because the mean of its divisors is an integer number (124874095).

Almost surely, 2^249748189 is an apocalyptic number.

It is an amenable number.

249748189 is a deficient number, since it is larger than the sum of its proper divisors (1).

249748189 is an equidigital number, since it uses as much as digits as its factorization.

249748189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 52.

The square root of 249748189 is about 15803.4233316709. The cubic root of 249748189 is about 629.7489459080.

The spelling of 249748189 in words is "two hundred forty-nine million, seven hundred forty-eight thousand, one hundred eighty-nine".