253736641 has 4 divisors (see below), whose sum is σ = 255982212. Its totient is φ = 251491072.

The previous prime is 253736629. The next prime is 253736663. The reversal of 253736641 is 146637352.

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 4223025 + 249513616 = 2055^2 + 15796^2 .

It is a cyclic number.

It is not a de Polignac number, because 253736641 - 2⁷ = 253736513 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 253736641.

It is not an unprimeable number, because it can be changed into a prime (253736141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1122616 + ... + 1122841.

It is an arithmetic number, because the mean of its divisors is an integer number (63995553).

Almost surely, 2^253736641 is an apocalyptic number.

It is an amenable number.

253736641 is a deficient number, since it is larger than the sum of its proper divisors (2245571).

253736641 is a wasteful number, since it uses less digits than its factorization.

253736641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245570.

The product of its digits is 90720, while the sum is 37.

The square root of 253736641 is about 15929.1130010431. The cubic root of 253736641 is about 633.0835982752.

The spelling of 253736641 in words is "two hundred fifty-three million, seven hundred thirty-six thousand, six hundred forty-one".