4941991 has 4 divisors (see below), whose sum is σ = 4946800. Its totient is φ = 4937184.

The previous prime is 4941983. The next prime is 4942013. The reversal of 4941991 is 1991494.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1991494 = 2 ⋅995747.

It is a cyclic number.

It is not a de Polignac number, because 4941991 - 2³ = 4941983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4941991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4941901) 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, 171 + ... + 3148.

It is an arithmetic number, because the mean of its divisors is an integer number (1236700).

Almost surely, 2^4941991 is an apocalyptic number.

4941991 is a deficient number, since it is larger than the sum of its proper divisors (4809).

4941991 is a wasteful number, since it uses less digits than its factorization.

4941991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4808.

The product of its digits is 11664, while the sum is 37.

The square root of 4941991 is about 2223.0589285937. The cubic root of 4941991 is about 170.3337273601. Note that the first 3 decimals are identical.

It can be divided in two parts, 494 and 1991, that added together give a triangular number (2485 = T₇₀).

The spelling of 4941991 in words is "four million, nine hundred forty-one thousand, nine hundred ninety-one".