16127989 has 2 divisors, whose sum is σ = 16127990. Its totient is φ = 16127988.

The previous prime is 16127981. The next prime is 16127999. The reversal of 16127989 is 98972161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11675889 + 4452100 = 3417^2 + 2110^2 .

It is a cyclic number.

It is not a de Polignac number, because 16127989 - 2³ = 16127981 is a prime.

It is a super-2 number, since 2×16127989² = 520224058368242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16127981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8063994 + 8063995.

It is an arithmetic number, because the mean of its divisors is an integer number (8063995).

Almost surely, 2^16127989 is an apocalyptic number.

It is an amenable number.

16127989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16127989 is an equidigital number, since it uses as much as digits as its factorization.

16127989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 43.

The square root of 16127989 is about 4015.9667578305. The cubic root of 16127989 is about 252.6543264658.

The spelling of 16127989 in words is "sixteen million, one hundred twenty-seven thousand, nine hundred eighty-nine".