249298991 has 2 divisors, whose sum is σ = 249298992. Its totient is φ = 249298990.

The previous prime is 249298949. The next prime is 249299003. The reversal of 249298991 is 199892942.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249298991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249298691) 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, 124649495 + 124649496.

It is an arithmetic number, because the mean of its divisors is an integer number (124649496).

Almost surely, 2^249298991 is an apocalyptic number.

249298991 is a deficient number, since it is larger than the sum of its proper divisors (1).

249298991 is an equidigital number, since it uses as much as digits as its factorization.

249298991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 53.

The square root of 249298991 is about 15789.2048881506. The cubic root of 249298991 is about 629.3711630762.

The spelling of 249298991 in words is "two hundred forty-nine million, two hundred ninety-eight thousand, nine hundred ninety-one".