491226221620 has 48 divisors (see below), whose sum is σ = 1035545792400. Its totient is φ = 195734568960.

The previous prime is 491226221599. The next prime is 491226221623. The reversal of 491226221620 is 26122622194.

It can be written as a sum of positive squares in 8 ways, for example, as 59553569296 + 431672652324 = 244036^2 + 657018^2 .

It is a super-2 number, since 2×491226221620² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 491226221620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491226221623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23194396 + ... + 23215564.

It is an arithmetic number, because the mean of its divisors is an integer number (21573870675).

Almost surely, 2^491226221620 is an apocalyptic number.

It is an amenable number.

491226221620 is an abundant number, since it is smaller than the sum of its proper divisors (544319570780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491226221620 is a wasteful number, since it uses less digits than its factorization.

491226221620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25588 (or 25586 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 491226221620 in words is "four hundred ninety-one billion, two hundred twenty-six million, two hundred twenty-one thousand, six hundred twenty".