4561891 has 2 divisors, whose sum is σ = 4561892. Its totient is φ = 4561890.

The previous prime is 4561883. The next prime is 4561897. The reversal of 4561891 is 1981654.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4561891 - 2³ = 4561883 is a prime.

It is not a weakly prime, because it can be changed into another prime (4561897) 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, 2280945 + 2280946.

It is an arithmetic number, because the mean of its divisors is an integer number (2280946).

Almost surely, 2^4561891 is an apocalyptic number.

4561891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4561891 is an equidigital number, since it uses as much as digits as its factorization.

4561891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The square root of 4561891 is about 2135.8583754547. The cubic root of 4561891 is about 165.8498060846.

The spelling of 4561891 in words is "four million, five hundred sixty-one thousand, eight hundred ninety-one".