9159981 has 8 divisors (see below), whose sum is σ = 12245664. Its totient is φ = 6090480.

The previous prime is 9159977. The next prime is 9160007. The reversal of 9159981 is 1899519.

9159981 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 9159981 - 2² = 9159977 is a prime.

It is a super-2 number, since 2×9159981² = 167810503840722, which contains 22 as substring.

It is a Curzon number.

9159981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9159901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2655 + ... + 5036.

It is an arithmetic number, because the mean of its divisors is an integer number (1530708).

Almost surely, 2^9159981 is an apocalyptic number.

It is an amenable number.

9159981 is a deficient number, since it is larger than the sum of its proper divisors (3085683).

9159981 is a wasteful number, since it uses less digits than its factorization.

9159981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8091.

The product of its digits is 29160, while the sum is 42.

The square root of 9159981 is about 3026.5460511943. The cubic root of 9159981 is about 209.2336466567.

The spelling of 9159981 in words is "nine million, one hundred fifty-nine thousand, nine hundred eighty-one".