491611897 has 8 divisors (see below), whose sum is σ = 570228416. Its totient is φ = 415091952.

The previous prime is 491611889. The next prime is 491611927. The reversal of 491611897 is 798116194.

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

It is a cyclic number.

It is not a de Polignac number, because 491611897 - 2³ = 491611889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491611807) 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, 523638 + ... + 524575.

It is an arithmetic number, because the mean of its divisors is an integer number (71278552).

Almost surely, 2^491611897 is an apocalyptic number.

It is an amenable number.

491611897 is a deficient number, since it is larger than the sum of its proper divisors (78616519).

491611897 is a wasteful number, since it uses less digits than its factorization.

491611897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048287.

The product of its digits is 108864, while the sum is 46.

The square root of 491611897 is about 22172.3227696153. The cubic root of 491611897 is about 789.2370442042.

The spelling of 491611897 in words is "four hundred ninety-one million, six hundred eleven thousand, eight hundred ninety-seven".