491201011 has 8 divisors (see below), whose sum is σ = 576545120. Its totient is φ = 409650048.

The previous prime is 491200991. The next prime is 491201023. The reversal of 491201011 is 110102194.

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-491201011 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 491201011.

It is not an unprimeable number, because it can be changed into a prime (491201411) 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, 948006 + ... + 948523.

It is an arithmetic number, because the mean of its divisors is an integer number (72068140).

Almost surely, 2^491201011 is an apocalyptic number.

491201011 is a deficient number, since it is larger than the sum of its proper divisors (85344109).

491201011 is a wasteful number, since it uses less digits than its factorization.

491201011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896573.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 491201011 is about 22163.0550917512. The cubic root of 491201011 is about 789.0171032022.

The spelling of 491201011 in words is "four hundred ninety-one million, two hundred one thousand, eleven".