249475649 has 2 divisors, whose sum is σ = 249475650. Its totient is φ = 249475648.

The previous prime is 249475619. The next prime is 249475651. The reversal of 249475649 is 946574942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205492225 + 43983424 = 14335^2 + 6632^2 .

It is a cyclic number.

It is not a de Polignac number, because 249475649 - 2²⁰ = 248427073 is a prime.

Together with 249475651, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 249475597 and 249475606.

It is not a weakly prime, because it can be changed into another prime (249475619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124737824 + 124737825.

It is an arithmetic number, because the mean of its divisors is an integer number (124737825).

Almost surely, 2^249475649 is an apocalyptic number.

It is an amenable number.

249475649 is a deficient number, since it is larger than the sum of its proper divisors (1).

249475649 is an equidigital number, since it uses as much as digits as its factorization.

249475649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 50.

The square root of 249475649 is about 15794.7981626863. The cubic root of 249475649 is about 629.5197894286.

The spelling of 249475649 in words is "two hundred forty-nine million, four hundred seventy-five thousand, six hundred forty-nine".