16244991 has 12 divisors (see below), whose sum is σ = 26817232. Its totient is φ = 9282816.

The previous prime is 16244989. The next prime is 16244999. The reversal of 16244991 is 19944261.

It is a happy number.

16244991 is a `hidden beast` number, since 162 + 4 + 499 + 1 = 666.

It is not a de Polignac number, because 16244991 - 2¹ = 16244989 is a prime.

It is a super-4 number, since 4×16244991⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16244999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128866 + ... + 128991.

Almost surely, 2^16244991 is an apocalyptic number.

16244991 is a deficient number, since it is larger than the sum of its proper divisors (10572241).

16244991 is a wasteful number, since it uses less digits than its factorization.

16244991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257870 (or 257867 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 16244991 is about 4030.5075362788. The cubic root of 16244991 is about 253.2638230731.

The spelling of 16244991 in words is "sixteen million, two hundred forty-four thousand, nine hundred ninety-one".