52689661 has 4 divisors (see below), whose sum is σ = 52825500. Its totient is φ = 52553824.

The previous prime is 52689653. The next prime is 52689673. The reversal of 52689661 is 16698625.

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 38514436 + 14175225 = 6206^2 + 3765^2 .

It is a cyclic number.

It is not a de Polignac number, because 52689661 - 2³ = 52689653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52689601) 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, 67336 + ... + 68113.

It is an arithmetic number, because the mean of its divisors is an integer number (13206375).

Almost surely, 2^52689661 is an apocalyptic number.

It is an amenable number.

52689661 is a deficient number, since it is larger than the sum of its proper divisors (135839).

52689661 is a wasteful number, since it uses less digits than its factorization.

52689661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135838.

The product of its digits is 155520, while the sum is 43.

The square root of 52689661 is about 7258.7644265398. The cubic root of 52689661 is about 374.8939812888.

The spelling of 52689661 in words is "fifty-two million, six hundred eighty-nine thousand, six hundred sixty-one".