249469861 has 4 divisors (see below), whose sum is σ = 258072300. Its totient is φ = 240867424.

The previous prime is 249469859. The next prime is 249469889. The reversal of 249469861 is 168964942.

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 173448900 + 76020961 = 13170^2 + 8719^2 .

It is a cyclic number.

It is not a de Polignac number, because 249469861 - 2¹ = 249469859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249469841) 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, 4301176 + ... + 4301233.

It is an arithmetic number, because the mean of its divisors is an integer number (64518075).

Almost surely, 2^249469861 is an apocalyptic number.

It is an amenable number.

249469861 is a deficient number, since it is larger than the sum of its proper divisors (8602439).

249469861 is an equidigital number, since it uses as much as digits as its factorization.

249469861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8602438.

The product of its digits is 746496, while the sum is 49.

The square root of 249469861 is about 15794.6149367435. The cubic root of 249469861 is about 629.5149209658.

The spelling of 249469861 in words is "two hundred forty-nine million, four hundred sixty-nine thousand, eight hundred sixty-one".