249491489 has 12 divisors (see below), whose sum is σ = 284382000. Its totient is φ = 218175984.

The previous prime is 249491483. The next prime is 249491491. The reversal of 249491489 is 984194942.

It is a de Polignac number, because none of the positive numbers 2^k-249491489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249491483) 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, 35639 + ... + 42060.

It is an arithmetic number, because the mean of its divisors is an integer number (23698500).

Almost surely, 2^249491489 is an apocalyptic number.

It is an amenable number.

249491489 is a deficient number, since it is larger than the sum of its proper divisors (34890511).

249491489 is a wasteful number, since it uses less digits than its factorization.

249491489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77744 (or 77731 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The square root of 249491489 is about 15795.2995856362. The cubic root of 249491489 is about 629.5331125491.

The spelling of 249491489 in words is "two hundred forty-nine million, four hundred ninety-one thousand, four hundred eighty-nine".