15981489 has 16 divisors (see below), whose sum is σ = 24923200. Its totient is φ = 10093248.

The previous prime is 15981419. The next prime is 15981541. The reversal of 15981489 is 98418951.

It is not a de Polignac number, because 15981489 - 2¹¹ = 15979441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15981419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15064 + ... + 16089.

It is an arithmetic number, because the mean of its divisors is an integer number (1557700).

Almost surely, 2^15981489 is an apocalyptic number.

15981489 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

15981489 is a deficient number, since it is larger than the sum of its proper divisors (8941711).

15981489 is a wasteful number, since it uses less digits than its factorization.

15981489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31181 (or 31175 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 15981489 is about 3997.6854553604. The cubic root of 15981489 is about 251.8869958185.

The spelling of 15981489 in words is "fifteen million, nine hundred eighty-one thousand, four hundred eighty-nine".