249888649 has 2 divisors, whose sum is σ = 249888650. Its totient is φ = 249888648.

The previous prime is 249888643. The next prime is 249888673. The reversal of 249888649 is 946888942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227798649 + 22090000 = 15093^2 + 4700^2 .

It is a cyclic number.

It is not a de Polignac number, because 249888649 - 2⁷ = 249888521 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 249888593 and 249888602.

It is not a weakly prime, because it can be changed into another prime (249888643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124944324 + 124944325.

It is an arithmetic number, because the mean of its divisors is an integer number (124944325).

Almost surely, 2^249888649 is an apocalyptic number.

It is an amenable number.

249888649 is a deficient number, since it is larger than the sum of its proper divisors (1).

249888649 is an equidigital number, since it uses as much as digits as its factorization.

249888649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7962624, while the sum is 58.

The square root of 249888649 is about 15807.8666808649. The cubic root of 249888649 is about 629.8669820787.

The spelling of 249888649 in words is "two hundred forty-nine million, eight hundred eighty-eight thousand, six hundred forty-nine".