491781926 has 16 divisors (see below), whose sum is σ = 750394368. Its totient is φ = 241672200.

The previous prime is 491781919. The next prime is 491781937. The reversal of 491781926 is 629187194.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41771 + ... + 52233.

It is an arithmetic number, because the mean of its divisors is an integer number (46899648).

Almost surely, 2^491781926 is an apocalyptic number.

491781926 is a deficient number, since it is larger than the sum of its proper divisors (258612442).

491781926 is a wasteful number, since it uses less digits than its factorization.

491781926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10867.

The product of its digits is 217728, while the sum is 47.

The square root of 491781926 is about 22176.1567003843. The cubic root of 491781926 is about 789.3280222829.

The spelling of 491781926 in words is "four hundred ninety-one million, seven hundred eighty-one thousand, nine hundred twenty-six".