4931391 has 4 divisors (see below), whose sum is σ = 6575192. Its totient is φ = 3287592.

The previous prime is 4931389. The next prime is 4931441. The reversal of 4931391 is 1931394.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 4931391 - 2¹ = 4931389 is a prime.

It is a D-number.

It is a Duffinian number.

4931391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4931191) 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, 821896 + ... + 821901.

It is an arithmetic number, because the mean of its divisors is an integer number (1643798).

Almost surely, 2^4931391 is an apocalyptic number.

4931391 is a deficient number, since it is larger than the sum of its proper divisors (1643801).

4931391 is a wasteful number, since it uses less digits than its factorization.

4931391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643800.

The product of its digits is 2916, while the sum is 30.

The square root of 4931391 is about 2220.6735464719. The cubic root of 4931391 is about 170.2118581282.

The spelling of 4931391 in words is "four million, nine hundred thirty-one thousand, three hundred ninety-one".