16251989 has 16 divisors (see below), whose sum is σ = 18187008. Its totient is φ = 14427072.

The previous prime is 16251953. The next prime is 16251997. The reversal of 16251989 is 98915261.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16251989 - 2¹² = 16247893 is a prime.

It is a super-2 number, since 2×16251989² = 528254292912242, which contains 22 as substring.

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 (16251929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40739 + ... + 41135.

It is an arithmetic number, because the mean of its divisors is an integer number (1136688).

Almost surely, 2^16251989 is an apocalyptic number.

It is an amenable number.

16251989 is a deficient number, since it is larger than the sum of its proper divisors (1935019).

16251989 is a wasteful number, since it uses less digits than its factorization.

16251989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its digits is 38880, while the sum is 41.

The square root of 16251989 is about 4031.3755716877. The cubic root of 16251989 is about 253.3001847594.

The spelling of 16251989 in words is "sixteen million, two hundred fifty-one thousand, nine hundred eighty-nine".