249342109 has 2 divisors, whose sum is σ = 249342110. Its totient is φ = 249342108.

The previous prime is 249342101. The next prime is 249342139. The reversal of 249342109 is 901243942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187279225 + 62062884 = 13685^2 + 7878^2 .

It is a cyclic number.

It is not a de Polignac number, because 249342109 - 2³ = 249342101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249342101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124671054 + 124671055.

It is an arithmetic number, because the mean of its divisors is an integer number (124671055).

Almost surely, 2^249342109 is an apocalyptic number.

It is an amenable number.

249342109 is a deficient number, since it is larger than the sum of its proper divisors (1).

249342109 is an equidigital number, since it uses as much as digits as its factorization.

249342109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 249342109 is about 15790.5702556937. The cubic root of 249342109 is about 629.4074456959.

The spelling of 249342109 in words is "two hundred forty-nine million, three hundred forty-two thousand, one hundred nine".