249924161 has 2 divisors, whose sum is σ = 249924162. Its totient is φ = 249924160.

The previous prime is 249924149. The next prime is 249924167. The reversal of 249924161 is 161429942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242736400 + 7187761 = 15580^2 + 2681^2 .

It is a cyclic number.

It is not a de Polignac number, because 249924161 - 2²² = 245729857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249924167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124962080 + 124962081.

It is an arithmetic number, because the mean of its divisors is an integer number (124962081).

Almost surely, 2^249924161 is an apocalyptic number.

It is an amenable number.

249924161 is a deficient number, since it is larger than the sum of its proper divisors (1).

249924161 is an equidigital number, since it uses as much as digits as its factorization.

249924161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 249924161 is about 15808.9898791795. The cubic root of 249924161 is about 629.8968177367.

The spelling of 249924161 in words is "two hundred forty-nine million, nine hundred twenty-four thousand, one hundred sixty-one".