491011111203 has 4 divisors (see below), whose sum is σ = 654681481608. Its totient is φ = 327340740800.

The previous prime is 491011111187. The next prime is 491011111207. The reversal of 491011111203 is 302111110194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491011111203 - 2⁴ = 491011111187 is a prime.

It is a super-2 number, since 2×491011111203² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491011111207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81835185198 + ... + 81835185203.

It is an arithmetic number, because the mean of its divisors is an integer number (163670370402).

Almost surely, 2^491011111203 is an apocalyptic number.

491011111203 is a deficient number, since it is larger than the sum of its proper divisors (163670370405).

491011111203 is a wasteful number, since it uses less digits than its factorization.

491011111203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163670370404.

The product of its (nonzero) digits is 216, while the sum is 24.

Adding to 491011111203 its reverse (302111110194), we get a palindrome (793122221397).

The spelling of 491011111203 in words is "four hundred ninety-one billion, eleven million, one hundred eleven thousand, two hundred three".