491567197 has 8 divisors (see below), whose sum is σ = 554747040. Its totient is φ = 431469360.

The previous prime is 491567179. The next prime is 491567227. The reversal of 491567197 is 791765194.

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-491567197 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 491567197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491567897) 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, 770163 + ... + 770800.

It is an arithmetic number, because the mean of its divisors is an integer number (69343380).

Almost surely, 2^491567197 is an apocalyptic number.

It is an amenable number.

491567197 is a deficient number, since it is larger than the sum of its proper divisors (63179843).

491567197 is a wasteful number, since it uses less digits than its factorization.

491567197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541003.

The product of its digits is 476280, while the sum is 49.

The square root of 491567197 is about 22171.3147332313. The cubic root of 491567197 is about 789.2131229190.

The spelling of 491567197 in words is "four hundred ninety-one million, five hundred sixty-seven thousand, one hundred ninety-seven".