491111130331 has 4 divisors (see below), whose sum is σ = 492373627200. Its totient is φ = 489848633464.

The previous prime is 491111130281. The next prime is 491111130347. The reversal of 491111130331 is 133031111194.

It is a happy number.

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 491111130331 - 2²¹ = 491109033179 is a prime.

It is a super-2 number, since 2×491111130331² (a number of 24 digits) contains 22 as substring.

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 491111130331.

It is not an unprimeable number, because it can be changed into a prime (491111130371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631247851 + ... + 631248628.

It is an arithmetic number, because the mean of its divisors is an integer number (123093406800).

Almost surely, 2^491111130331 is an apocalyptic number.

491111130331 is a deficient number, since it is larger than the sum of its proper divisors (1262496869).

491111130331 is a wasteful number, since it uses less digits than its factorization.

491111130331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262496868.

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 491111130331 in words is "four hundred ninety-one billion, one hundred eleven million, one hundred thirty thousand, three hundred thirty-one".