249535889 has 4 divisors (see below), whose sum is σ = 249571620. Its totient is φ = 249500160.

The previous prime is 249535861. The next prime is 249535919. The reversal of 249535889 is 988535942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 988535942 = 2 ⋅494267971.

It can be written as a sum of positive squares in 2 ways, for example, as 100500625 + 149035264 = 10025^2 + 12208^2 .

It is a cyclic number.

It is not a de Polignac number, because 249535889 - 2²⁰ = 248487313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 249535889.

It is not an unprimeable number, because it can be changed into a prime (249535829) 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, 3584 + ... + 22625.

It is an arithmetic number, because the mean of its divisors is an integer number (62392905).

Almost surely, 2^249535889 is an apocalyptic number.

It is an amenable number.

249535889 is a deficient number, since it is larger than the sum of its proper divisors (35731).

249535889 is an equidigital number, since it uses as much as digits as its factorization.

249535889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35730.

The product of its digits is 3110400, while the sum is 53.

The square root of 249535889 is about 15796.7050045255. The cubic root of 249535889 is about 629.5704546543.

Adding to 249535889 its sum of digits (53), we get a palindrome (249535942).

The spelling of 249535889 in words is "two hundred forty-nine million, five hundred thirty-five thousand, eight hundred eighty-nine".