16144991 has 2 divisors, whose sum is σ = 16144992. Its totient is φ = 16144990.

The previous prime is 16144979. The next prime is 16145027. The reversal of 16144991 is 19944161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16144991 is a prime.

It is a Chen prime.

It is a plaindrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16144901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8072495 + 8072496.

It is an arithmetic number, because the mean of its divisors is an integer number (8072496).

Almost surely, 2^16144991 is an apocalyptic number.

16144991 is a deficient number, since it is larger than the sum of its proper divisors (1).

16144991 is an equidigital number, since it uses as much as digits as its factorization.

16144991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 16144991 is about 4018.0830006360. The cubic root of 16144991 is about 252.7430773586.

The spelling of 16144991 in words is "sixteen million, one hundred forty-four thousand, nine hundred ninety-one".