249909523 has 2 divisors, whose sum is σ = 249909524. Its totient is φ = 249909522.

The previous prime is 249909493. The next prime is 249909533. The reversal of 249909523 is 325909942.

It is a happy number.

249909523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249909523 - 2²¹ = 247812371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249909523.

It is not a weakly prime, because it can be changed into another prime (249909533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124954761 + 124954762.

It is an arithmetic number, because the mean of its divisors is an integer number (124954762).

Almost surely, 2^249909523 is an apocalyptic number.

249909523 is a deficient number, since it is larger than the sum of its proper divisors (1).

249909523 is an equidigital number, since it uses as much as digits as its factorization.

249909523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 249909523 is about 15808.5269079696. The cubic root of 249909523 is about 629.8845198599.

The spelling of 249909523 in words is "two hundred forty-nine million, nine hundred nine thousand, five hundred twenty-three".