249997499 has 2 divisors, whose sum is σ = 249997500. Its totient is φ = 249997498.

The previous prime is 249997481. The next prime is 249997507. The reversal of 249997499 is 994799942.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249997499 - 2¹⁶ = 249931963 is a prime.

It is not a weakly prime, because it can be changed into another prime (249997469) 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, 124998749 + 124998750.

It is an arithmetic number, because the mean of its divisors is an integer number (124998750).

Almost surely, 2^249997499 is an apocalyptic number.

249997499 is a deficient number, since it is larger than the sum of its proper divisors (1).

249997499 is an equidigital number, since it uses as much as digits as its factorization.

249997499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 62.

The square root of 249997499 is about 15811.3092120798. The cubic root of 249997499 is about 629.9584242321.

The spelling of 249997499 in words is "two hundred forty-nine million, nine hundred ninety-seven thousand, four hundred ninety-nine".