4091691 has 4 divisors (see below), whose sum is σ = 5455592. Its totient is φ = 2727792.

The previous prime is 4091671. The next prime is 4091693. The reversal of 4091691 is 1961904.

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

It is not a de Polignac number, because 4091691 - 2⁶ = 4091627 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4091693) 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, 681946 + ... + 681951.

It is an arithmetic number, because the mean of its divisors is an integer number (1363898).

Almost surely, 2^4091691 is an apocalyptic number.

4091691 is a deficient number, since it is larger than the sum of its proper divisors (1363901).

4091691 is a wasteful number, since it uses less digits than its factorization.

4091691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363900.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 4091691 is about 2022.7928712550. The cubic root of 4091691 is about 159.9438735428.

The spelling of 4091691 in words is "four million, ninety-one thousand, six hundred ninety-one".