249138069 has 4 divisors (see below), whose sum is σ = 332184096. Its totient is φ = 166092044.

The previous prime is 249138011. The next prime is 249138083. The reversal of 249138069 is 960831942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 249138069 - 2²⁴ = 232360853 is a prime.

It is a super-2 number, since 2×249138069² = 124139554850097522, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 249138069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249138569) 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, 41523009 + ... + 41523014.

It is an arithmetic number, because the mean of its divisors is an integer number (83046024).

Almost surely, 2^249138069 is an apocalyptic number.

It is an amenable number.

249138069 is a deficient number, since it is larger than the sum of its proper divisors (83046027).

249138069 is an equidigital number, since it uses as much as digits as its factorization.

249138069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83046026.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 249138069 is about 15784.1081154432. The cubic root of 249138069 is about 629.2357146525.

The spelling of 249138069 in words is "two hundred forty-nine million, one hundred thirty-eight thousand, sixty-nine".