291441899421 has 10 divisors (see below), whose sum is σ = 435363825182. Its totient is φ = 194294599560.

The previous prime is 291441899407. The next prime is 291441899423. The reversal of 291441899421 is 124998144192.

291441899421 is a `hidden beast` number, since 2 + 91 + 4 + 41 + 8 + 99 + 421 = 666.

It can be written as a sum of positive squares in only one way, i.e., 269579024100 + 21862875321 = 519210^2 + 147861^2 .

It is not a de Polignac number, because 291441899421 - 2¹³ = 291441891229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291441899423) 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 9 ways as a sum of consecutive naturals, for example, 1799023990 + ... + 1799024151.

Almost surely, 2^291441899421 is an apocalyptic number.

It is an amenable number.

291441899421 is a deficient number, since it is larger than the sum of its proper divisors (143921925761).

291441899421 is an equidigital number, since it uses as much as digits as its factorization.

291441899421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3598048153 (or 3598048144 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The spelling of 291441899421 in words is "two hundred ninety-one billion, four hundred forty-one million, eight hundred ninety-nine thousand, four hundred twenty-one".