4991731 has 4 divisors (see below), whose sum is σ = 4997392. Its totient is φ = 4986072.

The previous prime is 4991719. The next prime is 4991771. The reversal of 4991731 is 1371994.

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.

It is a cyclic number.

It is not a de Polignac number, because 4991731 - 2¹⁹ = 4467443 is a prime.

It is a super-2 number, since 2×4991731² = 49834756752722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4991771) 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, 1191 + ... + 3376.

It is an arithmetic number, because the mean of its divisors is an integer number (1249348).

Almost surely, 2^4991731 is an apocalyptic number.

4991731 is a deficient number, since it is larger than the sum of its proper divisors (5661).

4991731 is a wasteful number, since it uses less digits than its factorization.

4991731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5660.

The product of its digits is 6804, while the sum is 34.

The square root of 4991731 is about 2234.2182077854. The cubic root of 4991731 is about 170.9032773805.

The spelling of 4991731 in words is "four million, nine hundred ninety-one thousand, seven hundred thirty-one".