249972559 has 2 divisors, whose sum is σ = 249972560. Its totient is φ = 249972558.

The previous prime is 249972551. The next prime is 249972577. The reversal of 249972559 is 955279942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249972559 - 2³ = 249972551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249972551) 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, 124986279 + 124986280.

It is an arithmetic number, because the mean of its divisors is an integer number (124986280).

Almost surely, 2^249972559 is an apocalyptic number.

249972559 is a deficient number, since it is larger than the sum of its proper divisors (1).

249972559 is an equidigital number, since it uses as much as digits as its factorization.

249972559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 52.

The square root of 249972559 is about 15810.5205164156. The cubic root of 249972559 is about 629.9374751084.

It can be divided in two parts, 24997 and 2559, that added together give a square (27556 = 166²).

The spelling of 249972559 in words is "two hundred forty-nine million, nine hundred seventy-two thousand, five hundred fifty-nine".