249609397 has 2 divisors, whose sum is σ = 249609398. Its totient is φ = 249609396.

The previous prime is 249609391. The next prime is 249609401. The reversal of 249609397 is 793906942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248819076 + 790321 = 15774^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 249609397 - 2¹¹ = 249607349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249609397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249609391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124804698 + 124804699.

It is an arithmetic number, because the mean of its divisors is an integer number (124804699).

Almost surely, 2^249609397 is an apocalyptic number.

It is an amenable number.

249609397 is a deficient number, since it is larger than the sum of its proper divisors (1).

249609397 is an equidigital number, since it uses as much as digits as its factorization.

249609397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 49.

The square root of 249609397 is about 15799.0315209509. The cubic root of 249609397 is about 629.6322679693.

The spelling of 249609397 in words is "two hundred forty-nine million, six hundred nine thousand, three hundred ninety-seven".