249998491 has 2 divisors, whose sum is σ = 249998492. Its totient is φ = 249998490.

The previous prime is 249998459. The next prime is 249998503. The reversal of 249998491 is 194899942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249998491 - 2⁵ = 249998459 is a prime.

It is not a weakly prime, because it can be changed into another prime (249398491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124999245 + 124999246.

It is an arithmetic number, because the mean of its divisors is an integer number (124999246).

Almost surely, 2^249998491 is an apocalyptic number.

249998491 is a deficient number, since it is larger than the sum of its proper divisors (1).

249998491 is an equidigital number, since it uses as much as digits as its factorization.

249998491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 55.

The square root of 249998491 is about 15811.3405820000. The cubic root of 249998491 is about 629.9592574643.

The spelling of 249998491 in words is "two hundred forty-nine million, nine hundred ninety-eight thousand, four hundred ninety-one".