249661793 has 2 divisors, whose sum is σ = 249661794. Its totient is φ = 249661792.

The previous prime is 249661777. The next prime is 249661831. The reversal of 249661793 is 397166942.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233845264 + 15816529 = 15292^2 + 3977^2 .

It is a cyclic number.

It is not a de Polignac number, because 249661793 - 2⁴ = 249661777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249661703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124830896 + 124830897.

It is an arithmetic number, because the mean of its divisors is an integer number (124830897).

Almost surely, 2^249661793 is an apocalyptic number.

It is an amenable number.

249661793 is a deficient number, since it is larger than the sum of its proper divisors (1).

249661793 is an equidigital number, since it uses as much as digits as its factorization.

249661793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 47.

The square root of 249661793 is about 15800.6896368481. The cubic root of 249661793 is about 629.6763206700.

The spelling of 249661793 in words is "two hundred forty-nine million, six hundred sixty-one thousand, seven hundred ninety-three".