249609247 has 2 divisors, whose sum is σ = 249609248. Its totient is φ = 249609246.

The previous prime is 249609211. The next prime is 249609253. The reversal of 249609247 is 742906942.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249609247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249609257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124804623 + 124804624.

It is an arithmetic number, because the mean of its divisors is an integer number (124804624).

Almost surely, 2^249609247 is an apocalyptic number.

249609247 is a deficient number, since it is larger than the sum of its proper divisors (1).

249609247 is an equidigital number, since it uses as much as digits as its factorization.

249609247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 249609247 is about 15799.0267738238. The cubic root of 249609247 is about 629.6321418457.

The spelling of 249609247 in words is "two hundred forty-nine million, six hundred nine thousand, two hundred forty-seven".