249740791 has 2 divisors, whose sum is σ = 249740792. Its totient is φ = 249740790.

The previous prime is 249740789. The next prime is 249740797. The reversal of 249740791 is 197047942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249740791 - 2¹ = 249740789 is a prime.

Together with 249740789, it forms a pair of twin primes.

It is equal to p_13665958 and since 249740791 and 13665958 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249740797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124870395 + 124870396.

It is an arithmetic number, because the mean of its divisors is an integer number (124870396).

Almost surely, 2^249740791 is an apocalyptic number.

249740791 is a deficient number, since it is larger than the sum of its proper divisors (1).

249740791 is an equidigital number, since it uses as much as digits as its factorization.

249740791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 249740791 is about 15803.1892667271. The cubic root of 249740791 is about 629.7427277398.

The spelling of 249740791 in words is "two hundred forty-nine million, seven hundred forty thousand, seven hundred ninety-one".