4691891 has 4 divisors (see below), whose sum is σ = 4700472. Its totient is φ = 4683312.

The previous prime is 4691887. The next prime is 4691899. The reversal of 4691891 is 1981964.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 4691891 - 2² = 4691887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4691899) 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, 3410 + ... + 4583.

It is an arithmetic number, because the mean of its divisors is an integer number (1175118).

Almost surely, 2^4691891 is an apocalyptic number.

4691891 is a deficient number, since it is larger than the sum of its proper divisors (8581).

4691891 is an equidigital number, since it uses as much as digits as its factorization.

4691891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8580.

The product of its digits is 15552, while the sum is 38.

The square root of 4691891 is about 2166.0773301062. The cubic root of 4691891 is about 167.4104786354.

The spelling of 4691891 in words is "four million, six hundred ninety-one thousand, eight hundred ninety-one".