491287677 has 4 divisors (see below), whose sum is σ = 655050240. Its totient is φ = 327525116.

The previous prime is 491287673. The next prime is 491287681. The reversal of 491287677 is 776782194.

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 an interprime number because it is at equal distance from previous prime (491287673) and next prime (491287681).

It is a cyclic number.

It is not a de Polignac number, because 491287677 - 2² = 491287673 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491287673) 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, 81881277 + ... + 81881282.

It is an arithmetic number, because the mean of its divisors is an integer number (163762560).

Almost surely, 2^491287677 is an apocalyptic number.

It is an amenable number.

491287677 is a deficient number, since it is larger than the sum of its proper divisors (163762563).

491287677 is a wasteful number, since it uses less digits than its factorization.

491287677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163762562.

The product of its digits is 1185408, while the sum is 51.

The square root of 491287677 is about 22165.0101962530. The cubic root of 491287677 is about 789.0635043927.

The spelling of 491287677 in words is "four hundred ninety-one million, two hundred eighty-seven thousand, six hundred seventy-seven".