249941987 has 4 divisors (see below), whose sum is σ = 251619600. Its totient is φ = 248264376.

The previous prime is 249941957. The next prime is 249942001. The reversal of 249941987 is 789149942.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249941987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249941927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838583 + ... + 838880.

It is an arithmetic number, because the mean of its divisors is an integer number (62904900).

Almost surely, 2^249941987 is an apocalyptic number.

249941987 is a deficient number, since it is larger than the sum of its proper divisors (1677613).

249941987 is a wasteful number, since it uses less digits than its factorization.

249941987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677612.

The product of its digits is 1306368, while the sum is 53.

The square root of 249941987 is about 15809.5536622638. The cubic root of 249941987 is about 629.9117933112.

The spelling of 249941987 in words is "two hundred forty-nine million, nine hundred forty-one thousand, nine hundred eighty-seven".