249845879 has 2 divisors, whose sum is σ = 249845880. Its totient is φ = 249845878.

The previous prime is 249845819. The next prime is 249845903. The reversal of 249845879 is 978548942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249845879 - 2⁸ = 249845623 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249845809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124922939 + 124922940.

It is an arithmetic number, because the mean of its divisors is an integer number (124922940).

Almost surely, 2^249845879 is an apocalyptic number.

249845879 is a deficient number, since it is larger than the sum of its proper divisors (1).

249845879 is an equidigital number, since it uses as much as digits as its factorization.

249845879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 56.

The square root of 249845879 is about 15806.5138155129. The cubic root of 249845879 is about 629.8310448082.

The spelling of 249845879 in words is "two hundred forty-nine million, eight hundred forty-five thousand, eight hundred seventy-nine".