249941381 has 2 divisors, whose sum is σ = 249941382. Its totient is φ = 249941380.

The previous prime is 249941357. The next prime is 249941399. The reversal of 249941381 is 183149942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249924481 + 16900 = 15809^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 249941381 - 2²² = 245747077 is a prime.

It is a super-2 number, since 2×249941381² = 124941387872374322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249947381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124970690 + 124970691.

It is an arithmetic number, because the mean of its divisors is an integer number (124970691).

Almost surely, 2^249941381 is an apocalyptic number.

It is an amenable number.

249941381 is a deficient number, since it is larger than the sum of its proper divisors (1).

249941381 is an equidigital number, since it uses as much as digits as its factorization.

249941381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 249941381 is about 15809.5344966258. The cubic root of 249941381 is about 629.9112842240.

The spelling of 249941381 in words is "two hundred forty-nine million, nine hundred forty-one thousand, three hundred eighty-one".