991846441 has 2 divisors, whose sum is σ = 991846442. Its totient is φ = 991846440.

The previous prime is 991846439. The next prime is 991846459. The reversal of 991846441 is 144648199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 864066025 + 127780416 = 29395^2 + 11304^2 .

It is an emirp because it is prime and its reverse (144648199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 991846441 - 2¹ = 991846439 is a prime.

Together with 991846439, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 991846391 and 991846400.

It is not a weakly prime, because it can be changed into another prime (991846241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495923220 + 495923221.

It is an arithmetic number, because the mean of its divisors is an integer number (495923221).

Almost surely, 2^991846441 is an apocalyptic number.

It is an amenable number.

991846441 is a deficient number, since it is larger than the sum of its proper divisors (1).

991846441 is an equidigital number, since it uses as much as digits as its factorization.

991846441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 46.

The square root of 991846441 is about 31493.5936501378. The cubic root of 991846441 is about 997.2747266320.

It can be divided in two parts, 99184 and 6441, that added together give a square (105625 = 325²).

The spelling of 991846441 in words is "nine hundred ninety-one million, eight hundred forty-six thousand, four hundred forty-one".