4991897 has 12 divisors (see below), whose sum is σ = 5540736. Its totient is φ = 4488000.

The previous prime is 4991893. The next prime is 4991923. The reversal of 4991897 is 7981994.

It is not a de Polignac number, because 4991897 - 2² = 4991893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4991893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6272 + ... + 7022.

It is an arithmetic number, because the mean of its divisors is an integer number (461728).

Almost surely, 2^4991897 is an apocalyptic number.

It is an amenable number.

4991897 is a deficient number, since it is larger than the sum of its proper divisors (548839).

4991897 is a wasteful number, since it uses less digits than its factorization.

4991897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808 (or 791 counting only the distinct ones).

The product of its digits is 163296, while the sum is 47.

The square root of 4991897 is about 2234.2553569366. The cubic root of 4991897 is about 170.9051718222.

The spelling of 4991897 in words is "four million, nine hundred ninety-one thousand, eight hundred ninety-seven".