491861995 has 8 divisors (see below), whose sum is σ = 601371216. Its totient is φ = 386065056.

The previous prime is 491861897. The next prime is 491862013. The reversal of 491861995 is 599168194.

It is a happy number.

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-491861995 is a prime.

It is a Duffinian 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, 927777 + ... + 928306.

It is an arithmetic number, because the mean of its divisors is an integer number (75171402).

Almost surely, 2^491861995 is an apocalyptic number.

491861995 is a deficient number, since it is larger than the sum of its proper divisors (109509221).

491861995 is a wasteful number, since it uses less digits than its factorization.

491861995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856141.

The product of its digits is 699840, while the sum is 52.

The square root of 491861995 is about 22177.9619216915. The cubic root of 491861995 is about 789.3708578518.

The spelling of 491861995 in words is "four hundred ninety-one million, eight hundred sixty-one thousand, nine hundred ninety-five".