495057781 has 4 divisors (see below), whose sum is σ = 496747692. Its totient is φ = 493367872.

The previous prime is 495057779. The next prime is 495057803. The reversal of 495057781 is 187750594.

It is a happy number.

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 337052881 + 158004900 = 18359^2 + 12570^2 .

It is a cyclic number.

It is not a de Polignac number, because 495057781 - 2¹ = 495057779 is a prime.

It is a super-2 number, since 2×495057781² = 490164413057287922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (495057481) 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, 844516 + ... + 845101.

It is an arithmetic number, because the mean of its divisors is an integer number (124186923).

Almost surely, 2^495057781 is an apocalyptic number.

It is an amenable number.

495057781 is a deficient number, since it is larger than the sum of its proper divisors (1689911).

495057781 is a wasteful number, since it uses less digits than its factorization.

495057781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689910.

The product of its (nonzero) digits is 352800, while the sum is 46.

The square root of 495057781 is about 22249.8939548035. The cubic root of 495057781 is about 791.0767675620.

The spelling of 495057781 in words is "four hundred ninety-five million, fifty-seven thousand, seven hundred eighty-one".