291646441849 has 27 divisors (see below), whose sum is σ = 341961505221. Its totient is φ = 248009347320.

The previous prime is 291646441783. The next prime is 291646441861. The reversal of 291646441849 is 948144646192.

It is a happy number.

The square root of 291646441849 is 540043.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 291646441849 - 2⁷ = 291646441721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 291646441793 and 291646441802.

It is not an unprimeable number, because it can be changed into a prime (291646441949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 676673664 + ... + 676674094.

Almost surely, 2^291646441849 is an apocalyptic number.

291646441849 is the 540043-rd square number.

291646441849 is the 270022-nd centered octagonal number.

It is an amenable number.

291646441849 is a deficient number, since it is larger than the sum of its proper divisors (50315063372).

291646441849 is an frugal number, since it uses more digits than its factorization.

291646441849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234 (or 617 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 58.

The spelling of 291646441849 in words is "two hundred ninety-one billion, six hundred forty-six million, four hundred forty-one thousand, eight hundred forty-nine".