491394061 has 8 divisors (see below), whose sum is σ = 532990584. Its totient is φ = 451207680.

The previous prime is 491394049. The next prime is 491394089. The reversal of 491394061 is 160493194.

It can be written as a sum of positive squares in 4 ways, for example, as 13097161 + 478296900 = 3619^2 + 21870^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491394061 is a prime.

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 491394061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491394091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351810 + ... + 353203.

It is an arithmetic number, because the mean of its divisors is an integer number (66623823).

Almost surely, 2^491394061 is an apocalyptic number.

491394061 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

491394061 is a deficient number, since it is larger than the sum of its proper divisors (41596523).

491394061 is a wasteful number, since it uses less digits than its factorization.

491394061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705071.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 491394061 is about 22167.4098847836. The cubic root of 491394061 is about 789.1204551891.

The spelling of 491394061 in words is "four hundred ninety-one million, three hundred ninety-four thousand, sixty-one".