495951681 has 4 divisors (see below), whose sum is σ = 661268912. Its totient is φ = 330634452.

The previous prime is 495951667. The next prime is 495951697. The reversal of 495951681 is 186159594.

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 not a de Polignac number, because 495951681 - 2¹⁹ = 495427393 is a prime.

It is a super-2 number, since 2×495951681² = 491936139773451522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 495951681.

It is not an unprimeable number, because it can be changed into a prime (495950681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82658611 + ... + 82658616.

It is an arithmetic number, because the mean of its divisors is an integer number (165317228).

Almost surely, 2^495951681 is an apocalyptic number.

It is an amenable number.

495951681 is a deficient number, since it is larger than the sum of its proper divisors (165317231).

495951681 is a wasteful number, since it uses less digits than its factorization.

495951681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165317230.

The product of its digits is 388800, while the sum is 48.

The square root of 495951681 is about 22269.9726313258. The cubic root of 495951681 is about 791.5526166168.

The spelling of 495951681 in words is "four hundred ninety-five million, nine hundred fifty-one thousand, six hundred eighty-one".