249891997 has 8 divisors (see below), whose sum is σ = 255505536. Its totient is φ = 244290912.

The previous prime is 249891991. The next prime is 249892003. The reversal of 249891997 is 799198942.

It is an interprime number because it is at equal distance from previous prime (249891991) and next prime (249892003).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249891997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249891991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45978 + ... + 51124.

It is an arithmetic number, because the mean of its divisors is an integer number (31938192).

Almost surely, 2^249891997 is an apocalyptic number.

It is an amenable number.

249891997 is a deficient number, since it is larger than the sum of its proper divisors (5613539).

249891997 is a wasteful number, since it uses less digits than its factorization.

249891997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6227.

The product of its digits is 2939328, while the sum is 58.

The square root of 249891997 is about 15807.9725771523. The cubic root of 249891997 is about 629.8697950453.

The spelling of 249891997 in words is "two hundred forty-nine million, eight hundred ninety-one thousand, nine hundred ninety-seven".