9781612159 has 16 divisors (see below), whose sum is σ = 11055359520. Its totient is φ = 8572869760.

The previous prime is 9781612157. The next prime is 9781612163. The reversal of 9781612159 is 9512161879.

It is a cyclic number.

It is not a de Polignac number, because 9781612159 - 2¹ = 9781612157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9781612153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193317 + ... + 238609.

It is an arithmetic number, because the mean of its divisors is an integer number (690959970).

Almost surely, 2^9781612159 is an apocalyptic number.

9781612159 is a deficient number, since it is larger than the sum of its proper divisors (1273747361).

9781612159 is a wasteful number, since it uses less digits than its factorization.

9781612159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46010.

The product of its digits is 272160, while the sum is 49.

The square root of 9781612159 is about 98902.0331388592. The cubic root of 9781612159 is about 2138.6357041352.

The spelling of 9781612159 in words is "nine billion, seven hundred eighty-one million, six hundred twelve thousand, one hundred fifty-nine".