491399667 has 12 divisors (see below), whose sum is σ = 774326904. Its totient is φ = 297817920.

The previous prime is 491399659. The next prime is 491399687. The reversal of 491399667 is 766993194.

491399667 is a `hidden beast` number, since 491 + 3 + 9 + 96 + 67 = 666.

It is not a de Polignac number, because 491399667 - 2³ = 491399659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491399647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2481718 + ... + 2481915.

It is an arithmetic number, because the mean of its divisors is an integer number (64527242).

Almost surely, 2^491399667 is an apocalyptic number.

491399667 is a deficient number, since it is larger than the sum of its proper divisors (282927237).

491399667 is a wasteful number, since it uses less digits than its factorization.

491399667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4963650 (or 4963647 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 491399667 is about 22167.5363313112. The cubic root of 491399667 is about 789.1234560343.

The spelling of 491399667 in words is "four hundred ninety-one million, three hundred ninety-nine thousand, six hundred sixty-seven".