4638691 has 2 divisors, whose sum is σ = 4638692. Its totient is φ = 4638690.

The previous prime is 4638677. The next prime is 4638721. The reversal of 4638691 is 1968364.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4638691 - 2⁵ = 4638659 is a prime.

It is a super-3 number, since 3×4638691³ (a number of 21 digits) contains 333 as substring.

It is a Chen prime.

4638691 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4638691.

It is not a weakly prime, because it can be changed into another prime (4638631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2319345 + 2319346.

It is an arithmetic number, because the mean of its divisors is an integer number (2319346).

Almost surely, 2^4638691 is an apocalyptic number.

4638691 is a deficient number, since it is larger than the sum of its proper divisors (1).

4638691 is an equidigital number, since it uses as much as digits as its factorization.

4638691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 4638691 is about 2153.7620574242. The cubic root of 4638691 is about 166.7753322465.

It can be divided in two parts, 4638 and 691, that added together give a square (5329 = 73²).

The spelling of 4638691 in words is "four million, six hundred thirty-eight thousand, six hundred ninety-one".