249992089 has 4 divisors (see below), whose sum is σ = 264697524. Its totient is φ = 235286656.

The previous prime is 249992087. The next prime is 249992111. The reversal of 249992089 is 980299942.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190440000 + 59552089 = 13800^2 + 7717^2 .

It is a cyclic number.

It is not a de Polignac number, because 249992089 - 2¹ = 249992087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249992081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7352692 + ... + 7352725.

It is an arithmetic number, because the mean of its divisors is an integer number (66174381).

Almost surely, 2^249992089 is an apocalyptic number.

It is an amenable number.

249992089 is a deficient number, since it is larger than the sum of its proper divisors (14705435).

249992089 is a wasteful number, since it uses less digits than its factorization.

249992089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14705434.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 249992089 is about 15811.1381310771. The cubic root of 249992089 is about 629.9538800537.

The spelling of 249992089 in words is "two hundred forty-nine million, nine hundred ninety-two thousand, eighty-nine".