491980831 has 4 divisors (see below), whose sum is σ = 494926992. Its totient is φ = 489034672.

The previous prime is 491980829. The next prime is 491980847. The reversal of 491980831 is 138089194.

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

It is a cyclic number.

It is not a de Polignac number, because 491980831 - 2¹ = 491980829 is a prime.

It is a super-2 number, since 2×491980831² = 484090276142901122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491980871) 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, 1472830 + ... + 1473163.

It is an arithmetic number, because the mean of its divisors is an integer number (123731748).

Almost surely, 2^491980831 is an apocalyptic number.

491980831 is a deficient number, since it is larger than the sum of its proper divisors (2946161).

491980831 is a wasteful number, since it uses less digits than its factorization.

491980831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2946160.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 491980831 is about 22180.6409059792. The cubic root of 491980831 is about 789.4344245451.

The spelling of 491980831 in words is "four hundred ninety-one million, nine hundred eighty thousand, eight hundred thirty-one".