491275658 has 8 divisors (see below), whose sum is σ = 737921028. Its totient is φ = 245301984.

The previous prime is 491275651. The next prime is 491275661. The reversal of 491275658 is 856572194.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 485453089 + 5822569 = 22033^2 + 2413^2 .

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

It is not an unprimeable number, because it can be changed into a prime (491275651) 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, 166091 + ... + 169022.

Almost surely, 2^491275658 is an apocalyptic number.

491275658 is a deficient number, since it is larger than the sum of its proper divisors (246645370).

491275658 is a wasteful number, since it uses less digits than its factorization.

491275658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335848.

The product of its digits is 604800, while the sum is 47.

The square root of 491275658 is about 22164.7390690709. The cubic root of 491275658 is about 789.0570697163.

The spelling of 491275658 in words is "four hundred ninety-one million, two hundred seventy-five thousand, six hundred fifty-eight".