249765889 has 2 divisors, whose sum is σ = 249765890. Its totient is φ = 249765888.

The previous prime is 249765871. The next prime is 249765907. The reversal of 249765889 is 988567942.

It is a balanced prime because it is at equal distance from previous prime (249765871) and next prime (249765907).

It can be written as a sum of positive squares in only one way, i.e., 236913664 + 12852225 = 15392^2 + 3585^2 .

It is a cyclic number.

It is not a de Polignac number, because 249765889 - 2²³ = 241377281 is a prime.

It is not a weakly prime, because it can be changed into another prime (249765289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124882944 + 124882945.

It is an arithmetic number, because the mean of its divisors is an integer number (124882945).

Almost surely, 2^249765889 is an apocalyptic number.

It is an amenable number.

249765889 is a deficient number, since it is larger than the sum of its proper divisors (1).

249765889 is an equidigital number, since it uses as much as digits as its factorization.

249765889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 58.

The square root of 249765889 is about 15803.9833269970. The cubic root of 249765889 is about 629.7638226165.

It can be divided in two parts, 2497 and 65889, that added together give a palindrome (68386).

The spelling of 249765889 in words is "two hundred forty-nine million, seven hundred sixty-five thousand, eight hundred eighty-nine".