491243431 has 16 divisors (see below), whose sum is σ = 575731008. Its totient is φ = 410457600.

The previous prime is 491243387. The next prime is 491243443. The reversal of 491243431 is 134342194.

It is not a de Polignac number, because 491243431 - 2⁷ = 491243303 is a prime.

It is a super-2 number, since 2×491243431² = 482640217001303522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491243393 and 491243402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491243491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43161 + ... + 53341.

It is an arithmetic number, because the mean of its divisors is an integer number (35983188).

Almost surely, 2^491243431 is an apocalyptic number.

491243431 is a deficient number, since it is larger than the sum of its proper divisors (84487577).

491243431 is a wasteful number, since it uses less digits than its factorization.

491243431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10362.

The product of its digits is 10368, while the sum is 31.

The square root of 491243431 is about 22164.0120691178. The cubic root of 491243431 is about 789.0398156569.

The spelling of 491243431 in words is "four hundred ninety-one million, two hundred forty-three thousand, four hundred thirty-one".