249049639 has 2 divisors, whose sum is σ = 249049640. Its totient is φ = 249049638.

The previous prime is 249049607. The next prime is 249049673. The reversal of 249049639 is 936940942.

249049639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249049639 - 2⁵ = 249049607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249046639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124524819 + 124524820.

It is an arithmetic number, because the mean of its divisors is an integer number (124524820).

Almost surely, 2^249049639 is an apocalyptic number.

249049639 is a deficient number, since it is larger than the sum of its proper divisors (1).

249049639 is an equidigital number, since it uses as much as digits as its factorization.

249049639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 249049639 is about 15781.3066315816. The cubic root of 249049639 is about 629.1612580816.

It can be divided in two parts, 24904 and 9639, that added together give a palindrome (34543).

The spelling of 249049639 in words is "two hundred forty-nine million, forty-nine thousand, six hundred thirty-nine".