249999913 has 4 divisors (see below), whose sum is σ = 251073108. Its totient is φ = 248926720.

The previous prime is 249999889. The next prime is 249999917. The reversal of 249999913 is 319999942.

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 158835609 + 91164304 = 12603^2 + 9548^2 .

It is a cyclic number.

It is not a de Polignac number, because 249999913 - 2¹⁷ = 249868841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249999917) 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, 536248 + ... + 536713.

It is an arithmetic number, because the mean of its divisors is an integer number (62768277).

Almost surely, 2^249999913 is an apocalyptic number.

It is an amenable number.

249999913 is a deficient number, since it is larger than the sum of its proper divisors (1073195).

249999913 is a wasteful number, since it uses less digits than its factorization.

249999913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073194.

The product of its digits is 1417176, while the sum is 55.

The square root of 249999913 is about 15811.3855496601. The cubic root of 249999913 is about 629.9604518720.

The spelling of 249999913 in words is "two hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred thirteen".