249995731 has 2 divisors, whose sum is σ = 249995732. Its totient is φ = 249995730.

The previous prime is 249995639. The next prime is 249995741. The reversal of 249995731 is 137599942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249995731 - 2¹³ = 249987539 is a prime.

It is a super-2 number, since 2×249995731² = 124995731036448722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (249995741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124997865 + 124997866.

It is an arithmetic number, because the mean of its divisors is an integer number (124997866).

Almost surely, 2^249995731 is an apocalyptic number.

249995731 is a deficient number, since it is larger than the sum of its proper divisors (1).

249995731 is an equidigital number, since it uses as much as digits as its factorization.

249995731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 49.

The square root of 249995731 is about 15811.2533026323. The cubic root of 249995731 is about 629.9569391917.

The spelling of 249995731 in words is "two hundred forty-nine million, nine hundred ninety-five thousand, seven hundred thirty-one".