491321927 has 4 divisors (see below), whose sum is σ = 504600936. Its totient is φ = 478042920.

The previous prime is 491321911. The next prime is 491321939. The reversal of 491321927 is 729123194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 729123194 = 2 ⋅364561597.

It is a cyclic number.

It is not a de Polignac number, because 491321927 - 2⁴ = 491321911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491321977) 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, 6639449 + ... + 6639522.

It is an arithmetic number, because the mean of its divisors is an integer number (126150234).

Almost surely, 2^491321927 is an apocalyptic number.

491321927 is a deficient number, since it is larger than the sum of its proper divisors (13279009).

491321927 is a wasteful number, since it uses less digits than its factorization.

491321927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13279008.

The product of its digits is 27216, while the sum is 38.

The square root of 491321927 is about 22165.7827969147. The cubic root of 491321927 is about 789.0818404229.

The spelling of 491321927 in words is "four hundred ninety-one million, three hundred twenty-one thousand, nine hundred twenty-seven".