16149989 has 2 divisors, whose sum is σ = 16149990. Its totient is φ = 16149988.

The previous prime is 16149901. The next prime is 16149997. The reversal of 16149989 is 98994161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14668900 + 1481089 = 3830^2 + 1217^2 .

It is a cyclic number.

It is not a de Polignac number, because 16149989 - 2¹² = 16145893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16119989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8074994 + 8074995.

It is an arithmetic number, because the mean of its divisors is an integer number (8074995).

Almost surely, 2^16149989 is an apocalyptic number.

It is an amenable number.

16149989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16149989 is an equidigital number, since it uses as much as digits as its factorization.

16149989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 47.

The square root of 16149989 is about 4018.7048908821. The cubic root of 16149989 is about 252.7691552006.

The spelling of 16149989 in words is "sixteen million, one hundred forty-nine thousand, nine hundred eighty-nine".