52501661 has 4 divisors (see below), whose sum is σ = 55590012. Its totient is φ = 49413312.

The previous prime is 52501633. The next prime is 52501717. The reversal of 52501661 is 16610525.

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 29365561 + 23136100 = 5419^2 + 4810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52501661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 52501661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52501601) 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, 1544150 + ... + 1544183.

It is an arithmetic number, because the mean of its divisors is an integer number (13897503).

Almost surely, 2^52501661 is an apocalyptic number.

It is an amenable number.

52501661 is a deficient number, since it is larger than the sum of its proper divisors (3088351).

52501661 is a wasteful number, since it uses less digits than its factorization.

52501661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3088350.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 52501661 is about 7245.8029920776. The cubic root of 52501661 is about 374.4475682136.

The spelling of 52501661 in words is "fifty-two million, five hundred one thousand, six hundred sixty-one".