494777991 has 4 divisors (see below), whose sum is σ = 659703992. Its totient is φ = 329851992.

The previous prime is 494777989. The next prime is 494778029. The reversal of 494777991 is 199777494.

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

It is not a de Polignac number, because 494777991 - 2¹ = 494777989 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 (494777291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82462996 + ... + 82463001.

It is an arithmetic number, because the mean of its divisors is an integer number (164925998).

Almost surely, 2^494777991 is an apocalyptic number.

494777991 is a deficient number, since it is larger than the sum of its proper divisors (164926001).

494777991 is a wasteful number, since it uses less digits than its factorization.

494777991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164926000.

The product of its digits is 4000752, while the sum is 57.

The square root of 494777991 is about 22243.6056204924. The cubic root of 494777991 is about 790.9277094874.

The spelling of 494777991 in words is "four hundred ninety-four million, seven hundred seventy-seven thousand, nine hundred ninety-one".