495731561 has 4 divisors (see below), whose sum is σ = 533864772. Its totient is φ = 457598352.

The previous prime is 495731549. The next prime is 495731569. The reversal of 495731561 is 165137594.

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 92525161 + 403206400 = 9619^2 + 20080^2 .

It is a cyclic number.

It is not a de Polignac number, because 495731561 - 2⁶ = 495731497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (495731569) 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, 19066586 + ... + 19066611.

It is an arithmetic number, because the mean of its divisors is an integer number (133466193).

Almost surely, 2^495731561 is an apocalyptic number.

It is an amenable number.

495731561 is a deficient number, since it is larger than the sum of its proper divisors (38133211).

495731561 is a wasteful number, since it uses less digits than its factorization.

495731561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38133210.

The product of its digits is 113400, while the sum is 41.

The square root of 495731561 is about 22265.0300022255. The cubic root of 495731561 is about 791.4354934156.

The spelling of 495731561 in words is "four hundred ninety-five million, seven hundred thirty-one thousand, five hundred sixty-one".