4549991 has 2 divisors, whose sum is σ = 4549992. Its totient is φ = 4549990.

The previous prime is 4549973. The next prime is 4550003. The reversal of 4549991 is 1999454.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4549991 - 2¹⁰ = 4548967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4549291) 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, 2274995 + 2274996.

It is an arithmetic number, because the mean of its divisors is an integer number (2274996).

Almost surely, 2^4549991 is an apocalyptic number.

4549991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4549991 is an equidigital number, since it uses as much as digits as its factorization.

4549991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 4549991 is about 2133.0707911366. The cubic root of 4549991 is about 165.7054703778.

The spelling of 4549991 in words is "four million, five hundred forty-nine thousand, nine hundred ninety-one".