491327081645 has 32 divisors (see below), whose sum is σ = 605686118400. Its totient is φ = 382475229696.

The previous prime is 491327081639. The next prime is 491327081647. The reversal of 491327081645 is 546180723194.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 491327081645 - 2³⁸ = 216449174701 is a prime.

It is a super-3 number, since 3×491327081645³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 491327081593 and 491327081602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491327081647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34945457 + ... + 34959513.

It is an arithmetic number, because the mean of its divisors is an integer number (18927691200).

It is a 1-persistent number, because it is pandigital, but 2⋅491327081645 = 982654163290 is not.

Almost surely, 2^491327081645 is an apocalyptic number.

It is an amenable number.

491327081645 is a deficient number, since it is larger than the sum of its proper divisors (114359036755).

491327081645 is a wasteful number, since it uses less digits than its factorization.

491327081645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15317.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 491327081645 in words is "four hundred ninety-one billion, three hundred twenty-seven million, eighty-one thousand, six hundred forty-five".