495661 has 4 divisors (see below), whose sum is σ = 507232. Its totient is φ = 484092.

The previous prime is 495647. The next prime is 495667. The reversal of 495661 is 166594.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 495661 - 2⁵ = 495629 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 (495667) 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, 5721 + ... + 5806.

It is an arithmetic number, because the mean of its divisors is an integer number (126808).

2⁴⁹⁵⁶⁶¹ is an apocalyptic number.

It is an amenable number.

495661 is a deficient number, since it is larger than the sum of its proper divisors (11571).

495661 is a wasteful number, since it uses less digits than its factorization.

495661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11570.

The product of its digits is 6480, while the sum is 31.

The square root of 495661 is about 704.0319595018. The cubic root of 495661 is about 79.1397941419.

It can be divided in two parts, 495 and 661, that added together give a square (1156 = 34²).

The spelling of 495661 in words is "four hundred ninety-five thousand, six hundred sixty-one".