53649569 has 8 divisors (see below), whose sum is σ = 57170088. Its totient is φ = 50169600.

The previous prime is 53649553. The next prime is 53649571. The reversal of 53649569 is 96594635.

It can be written as a sum of positive squares in 4 ways, for example, as 6315169 + 47334400 = 2513^2 + 6880^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53649569 - 2⁴ = 53649553 is a prime.

It is a super-2 number, since 2×53649569² = 5756552507771522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53649529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7382 + ... + 12719.

It is an arithmetic number, because the mean of its divisors is an integer number (7146261).

Almost surely, 2^53649569 is an apocalyptic number.

It is an amenable number.

53649569 is a deficient number, since it is larger than the sum of its proper divisors (3520519).

53649569 is a wasteful number, since it uses less digits than its factorization.

53649569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20275.

The product of its digits is 874800, while the sum is 47.

The square root of 53649569 is about 7324.5866094954. The cubic root of 53649569 is about 377.1569188248.

It can be divided in two parts, 536 and 49569, that added together give a palindrome (50105).

The spelling of 53649569 in words is "fifty-three million, six hundred forty-nine thousand, five hundred sixty-nine".