491401647 has 48 divisors (see below), whose sum is σ = 838027008. Its totient is φ = 284834880.

The previous prime is 491401627. The next prime is 491401649. The reversal of 491401647 is 746104194.

491401647 is a `hidden beast` number, since 4 + 9 + 1 + 4 + 0 + 1 + 647 = 666.

It is not a de Polignac number, because 491401647 - 2²³ = 483013039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491401649) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57483 + ... + 65475.

It is an arithmetic number, because the mean of its divisors is an integer number (17458896).

Almost surely, 2^491401647 is an apocalyptic number.

491401647 is a deficient number, since it is larger than the sum of its proper divisors (346625361).

491401647 is a wasteful number, since it uses less digits than its factorization.

491401647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8042 (or 8030 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 491401647 is about 22167.5809911682. The cubic root of 491401647 is about 789.1245159063.

The spelling of 491401647 in words is "four hundred ninety-one million, four hundred one thousand, six hundred forty-seven".