491213195026 has 64 divisors (see below), whose sum is σ = 803653488000. Its totient is φ = 224380316160.

The previous prime is 491213195009. The next prime is 491213195027. The reversal of 491213195026 is 620591312194.

It is a super-2 number, since 2×491213195026² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491213195027) 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 31 ways as a sum of consecutive naturals, for example, 237414720 + ... + 237416788.

It is an arithmetic number, because the mean of its divisors is an integer number (12557085750).

Almost surely, 2^491213195026 is an apocalyptic number.

491213195026 is a deficient number, since it is larger than the sum of its proper divisors (312440292974).

491213195026 is a wasteful number, since it uses less digits than its factorization.

491213195026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3547.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 491213195026 in words is "four hundred ninety-one billion, two hundred thirteen million, one hundred ninety-five thousand, twenty-six".