249909497 has 4 divisors (see below), whose sum is σ = 254006436. Its totient is φ = 245812560.

The previous prime is 249909493. The next prime is 249909523. The reversal of 249909497 is 794909942.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31933801 + 217975696 = 5651^2 + 14764^2 .

It is a cyclic number.

It is not a de Polignac number, because 249909497 - 2² = 249909493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249909493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2048378 + ... + 2048499.

It is an arithmetic number, because the mean of its divisors is an integer number (63501609).

Almost surely, 2^249909497 is an apocalyptic number.

It is an amenable number.

249909497 is a deficient number, since it is larger than the sum of its proper divisors (4096939).

249909497 is an equidigital number, since it uses as much as digits as its factorization.

249909497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4096938.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The square root of 249909497 is about 15808.5260856286. The cubic root of 249909497 is about 629.8844980160.

The spelling of 249909497 in words is "two hundred forty-nine million, nine hundred nine thousand, four hundred ninety-seven".