15981995 has 8 divisors (see below), whose sum is σ = 19365216. Its totient is φ = 12661056.

The previous prime is 15981971. The next prime is 15982013. The reversal of 15981995 is 59918951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15981995 - 2¹⁰ = 15980971 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15002 + ... + 16031.

It is an arithmetic number, because the mean of its divisors is an integer number (2420652).

Almost surely, 2^15981995 is an apocalyptic number.

15981995 is a deficient number, since it is larger than the sum of its proper divisors (3383221).

15981995 is a wasteful number, since it uses less digits than its factorization.

15981995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31141.

The product of its digits is 145800, while the sum is 47.

The square root of 15981995 is about 3997.7487414794. The cubic root of 15981995 is about 251.8896541747.

It can be divided in two parts, 159819 and 95, that multiplied together give a triangular number (15182805 = T₅₅₁₀).

The spelling of 15981995 in words is "fifteen million, nine hundred eighty-one thousand, nine hundred ninety-five".