5209661 has 8 divisors (see below), whose sum is σ = 5503680. Its totient is φ = 4921312.

The previous prime is 5209657. The next prime is 5209669. The reversal of 5209661 is 1669025.

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 5209661 - 2² = 5209657 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5209669) 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, 545 + ... + 3273.

It is an arithmetic number, because the mean of its divisors is an integer number (687960).

Almost surely, 2^5209661 is an apocalyptic number.

It is an amenable number.

5209661 is a deficient number, since it is larger than the sum of its proper divisors (294019).

5209661 is a wasteful number, since it uses less digits than its factorization.

5209661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 5209661 is about 2282.4681815964. The cubic root of 5209661 is about 173.3550461787.

The spelling of 5209661 in words is "five million, two hundred nine thousand, six hundred sixty-one".