249778969 has 12 divisors (see below), whose sum is σ = 276544240. Its totient is φ = 225423000.

The previous prime is 249778967. The next prime is 249778979. The reversal of 249778969 is 969877942.

It is not a de Polignac number, because 249778969 - 2¹ = 249778967 is a prime.

It is a super-2 number, since 2×249778969² = 124779066709405922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249778967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9394 + ... + 24244.

Almost surely, 2^249778969 is an apocalyptic number.

It is an amenable number.

249778969 is a deficient number, since it is larger than the sum of its proper divisors (26765271).

249778969 is a wasteful number, since it uses less digits than its factorization.

249778969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15012 (or 15001 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 61.

The square root of 249778969 is about 15804.3971413022. The cubic root of 249778969 is about 629.7748158003.

The spelling of 249778969 in words is "two hundred forty-nine million, seven hundred seventy-eight thousand, nine hundred sixty-nine".