996981187 has 16 divisors (see below), whose sum is σ = 1037141248. Its totient is φ = 957731040.

The previous prime is 996981163. The next prime is 996981191. The reversal of 996981187 is 781189699.

It is a cyclic number.

It is not a de Polignac number, because 996981187 - 2¹⁵ = 996948419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (996981107) 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, 721237 + ... + 722617.

It is an arithmetic number, because the mean of its divisors is an integer number (64821328).

Almost surely, 2^996981187 is an apocalyptic number.

996981187 is a deficient number, since it is larger than the sum of its proper divisors (40160061).

996981187 is a wasteful number, since it uses less digits than its factorization.

996981187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690.

The product of its digits is 1959552, while the sum is 58.

The square root of 996981187 is about 31575.0088994445. The cubic root of 996981187 is about 998.9927147170.

The spelling of 996981187 in words is "nine hundred ninety-six million, nine hundred eighty-one thousand, one hundred eighty-seven".