253239661 has 4 divisors (see below), whose sum is σ = 253991452. Its totient is φ = 252487872.

The previous prime is 253239659. The next prime is 253239689. The reversal of 253239661 is 166932352.

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 136188900 + 117050761 = 11670^2 + 10819^2 .

It is a cyclic number.

It is not a de Polignac number, because 253239661 - 2¹ = 253239659 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 253239661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253239601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375390 + ... + 376063.

It is an arithmetic number, because the mean of its divisors is an integer number (63497863).

Almost surely, 2^253239661 is an apocalyptic number.

It is an amenable number.

253239661 is a deficient number, since it is larger than the sum of its proper divisors (751791).

253239661 is an equidigital number, since it uses as much as digits as its factorization.

253239661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751790.

The product of its digits is 58320, while the sum is 37.

The square root of 253239661 is about 15913.5056162996. The cubic root of 253239661 is about 632.6699994544.

The spelling of 253239661 in words is "two hundred fifty-three million, two hundred thirty-nine thousand, six hundred sixty-one".