491342905 has 16 divisors (see below), whose sum is σ = 616253184. Its totient is φ = 375369280.

The previous prime is 491342851. The next prime is 491342909. The reversal of 491342905 is 509243194.

It is not a de Polignac number, because 491342905 - 2¹⁵ = 491310137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491342909) 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, 74700 + ... + 81010.

It is an arithmetic number, because the mean of its divisors is an integer number (38515824).

Almost surely, 2^491342905 is an apocalyptic number.

It is an amenable number.

491342905 is a deficient number, since it is larger than the sum of its proper divisors (124910279).

491342905 is a wasteful number, since it uses less digits than its factorization.

491342905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7016.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 491342905 is about 22166.2559987022. The cubic root of 491342905 is about 789.0930707536.

It can be divided in two parts, 491 and 342905, that added together give a square (343396 = 586²).

The spelling of 491342905 in words is "four hundred ninety-one million, three hundred forty-two thousand, nine hundred five".