253665189 has 10 divisors (see below), whose sum is σ = 378932070. Its totient is φ = 169110072.

The previous prime is 253665187. The next prime is 253665239. The reversal of 253665189 is 981566352.

It can be written as a sum of positive squares in only one way, i.e., 248062500 + 5602689 = 15750^2 + 2367^2 .

It is not a de Polignac number, because 253665189 - 2¹ = 253665187 is a prime.

It is a super-2 number, since 2×253665189² = 128692056220811442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253665187) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1565754 + ... + 1565915.

It is an arithmetic number, because the mean of its divisors is an integer number (37893207).

Almost surely, 2^253665189 is an apocalyptic number.

It is an amenable number.

253665189 is a deficient number, since it is larger than the sum of its proper divisors (125266881).

253665189 is an equidigital number, since it uses as much as digits as its factorization.

253665189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3131681 (or 3131672 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 253665189 is about 15926.8700314908. The cubic root of 253665189 is about 633.0241674473.

The spelling of 253665189 in words is "two hundred fifty-three million, six hundred sixty-five thousand, one hundred eighty-nine".