4921391 has 2 divisors, whose sum is σ = 4921392. Its totient is φ = 4921390.

The previous prime is 4921373. The next prime is 4921403. The reversal of 4921391 is 1931294.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4921391 - 2¹⁴ = 4905007 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4921291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2460695 + 2460696.

It is an arithmetic number, because the mean of its divisors is an integer number (2460696).

Almost surely, 2^4921391 is an apocalyptic number.

4921391 is a deficient number, since it is larger than the sum of its proper divisors (1).

4921391 is an equidigital number, since it uses as much as digits as its factorization.

4921391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 4921391 is about 2218.4208347381. The cubic root of 4921391 is about 170.0967269606.

The spelling of 4921391 in words is "four million, nine hundred twenty-one thousand, three hundred ninety-one".