991444413 has 4 divisors (see below), whose sum is σ = 1321925888. Its totient is φ = 660962940.

The previous prime is 991444393. The next prime is 991444427. The reversal of 991444413 is 314444199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 991444413 - 2¹³ = 991436221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991444313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165240733 + ... + 165240738.

It is an arithmetic number, because the mean of its divisors is an integer number (330481472).

Almost surely, 2^991444413 is an apocalyptic number.

It is an amenable number.

991444413 is a deficient number, since it is larger than the sum of its proper divisors (330481475).

991444413 is a wasteful number, since it uses less digits than its factorization.

991444413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330481474.

The product of its digits is 62208, while the sum is 39.

The square root of 991444413 is about 31487.2103083141. The cubic root of 991444413 is about 997.1399656685.

The spelling of 991444413 in words is "nine hundred ninety-one million, four hundred forty-four thousand, four hundred thirteen".