249387999989 has 2 divisors, whose sum is σ = 249387999990. Its totient is φ = 249387999988.

The previous prime is 249387999943. The next prime is 249387999997. The reversal of 249387999989 is 989999783942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249010980100 + 377019889 = 499010^2 + 19417^2 .

It is a cyclic number.

It is not a de Polignac number, because 249387999989 - 2¹² = 249387995893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249387999989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249387993989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124693999994 + 124693999995.

It is an arithmetic number, because the mean of its divisors is an integer number (124693999995).

Almost surely, 2^249387999989 is an apocalyptic number.

It is an amenable number.

249387999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

249387999989 is an equidigital number, since it uses as much as digits as its factorization.

249387999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5714053632, while the sum is 86.

The spelling of 249387999989 in words is "two hundred forty-nine billion, three hundred eighty-seven million, nine hundred ninety-nine thousand, nine hundred eighty-nine".