492391681 has 4 divisors (see below), whose sum is σ = 492640000. Its totient is φ = 492143364.

The previous prime is 492391663. The next prime is 492391709. The reversal of 492391681 is 186193294.

It is a happy number.

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 492391681 - 2⁹ = 492391169 is a prime.

It is a super-2 number, since 2×492391681² = 484899135036011522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (492391661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121161 + ... + 125158.

It is an arithmetic number, because the mean of its divisors is an integer number (123160000).

Almost surely, 2^492391681 is an apocalyptic number.

It is an amenable number.

492391681 is a deficient number, since it is larger than the sum of its proper divisors (248319).

492391681 is a wasteful number, since it uses less digits than its factorization.

492391681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248318.

The product of its digits is 93312, while the sum is 43.

The square root of 492391681 is about 22189.9004278974. The cubic root of 492391681 is about 789.6541139247.

The spelling of 492391681 in words is "four hundred ninety-two million, three hundred ninety-one thousand, six hundred eighty-one".