249955591 has 2 divisors, whose sum is σ = 249955592. Its totient is φ = 249955590.

The previous prime is 249955549. The next prime is 249955597. The reversal of 249955591 is 195559942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249955591 - 2¹⁵ = 249922823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249955597) 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, 124977795 + 124977796.

It is an arithmetic number, because the mean of its divisors is an integer number (124977796).

Almost surely, 2^249955591 is an apocalyptic number.

249955591 is a deficient number, since it is larger than the sum of its proper divisors (1).

249955591 is an equidigital number, since it uses as much as digits as its factorization.

249955591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 729000, while the sum is 49.

The square root of 249955591 is about 15809.9839025851. The cubic root of 249955591 is about 629.9232215159.

The spelling of 249955591 in words is "two hundred forty-nine million, nine hundred fifty-five thousand, five hundred ninety-one".