495493991 has 4 divisors (see below), whose sum is σ = 517037232. Its totient is φ = 473950752.

The previous prime is 495493937. The next prime is 495493993. The reversal of 495493991 is 199394594.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 495493991 - 2⁶ = 495493927 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 (495493993) 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, 10771586 + ... + 10771631.

It is an arithmetic number, because the mean of its divisors is an integer number (129259308).

Almost surely, 2^495493991 is an apocalyptic number.

495493991 is a deficient number, since it is larger than the sum of its proper divisors (21543241).

495493991 is a wasteful number, since it uses less digits than its factorization.

495493991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21543240.

The product of its digits is 1574640, while the sum is 53.

The square root of 495493991 is about 22259.6943150619. The cubic root of 495493991 is about 791.3090463703.

The spelling of 495493991 in words is "four hundred ninety-five million, four hundred ninety-three thousand, nine hundred ninety-one".