249997969 has 4 divisors (see below), whose sum is σ = 269228596. Its totient is φ = 230767344.

The previous prime is 249997967. The next prime is 249997973. The reversal of 249997969 is 969799942.

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 47789569 + 202208400 = 6913^2 + 14220^2 .

It is a cyclic number.

It is not a de Polignac number, because 249997969 - 2¹ = 249997967 is a prime.

It is a super-2 number, since 2×249997969² = 124997969008249922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 249997969.

It is not an unprimeable number, because it can be changed into a prime (249997963) 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, 9615294 + ... + 9615319.

It is an arithmetic number, because the mean of its divisors is an integer number (67307149).

Almost surely, 2^249997969 is an apocalyptic number.

It is an amenable number.

249997969 is a deficient number, since it is larger than the sum of its proper divisors (19230627).

249997969 is a wasteful number, since it uses less digits than its factorization.

249997969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19230626.

The product of its digits is 19840464, while the sum is 64.

The square root of 249997969 is about 15811.3240748522. The cubic root of 249997969 is about 629.9588190097.

The spelling of 249997969 in words is "two hundred forty-nine million, nine hundred ninety-seven thousand, nine hundred sixty-nine".