249220717 has 2 divisors, whose sum is σ = 249220718. Its totient is φ = 249220716.

The previous prime is 249220691. The next prime is 249220729. The reversal of 249220717 is 717022942.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244265641 + 4955076 = 15629^2 + 2226^2 .

It is a cyclic number.

It is not a de Polignac number, because 249220717 - 2²⁷ = 115002989 is a prime.

It is a super-2 number, since 2×249220717² = 124221931563988178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249220817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124610358 + 124610359.

It is an arithmetic number, because the mean of its divisors is an integer number (124610359).

Almost surely, 2^249220717 is an apocalyptic number.

It is an amenable number.

249220717 is a deficient number, since it is larger than the sum of its proper divisors (1).

249220717 is an equidigital number, since it uses as much as digits as its factorization.

249220717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 249220717 is about 15786.7259746915. The cubic root of 249220717 is about 629.3052869503.

The spelling of 249220717 in words is "two hundred forty-nine million, two hundred twenty thousand, seven hundred seventeen".