120165981 has 16 divisors (see below), whose sum is σ = 176219904. Its totient is φ = 72373824.

The previous prime is 120165971. The next prime is 120166001. The reversal of 120165981 is 189561021.

It is not a de Polignac number, because 120165981 - 2²² = 115971677 is a prime.

It is a super-2 number, since 2×120165981² = 28879725979384722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120165971) 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, 30946 + ... + 34611.

It is an arithmetic number, because the mean of its divisors is an integer number (11013744).

Almost surely, 2^120165981 is an apocalyptic number.

It is an amenable number.

120165981 is a deficient number, since it is larger than the sum of its proper divisors (56053923).

120165981 is a wasteful number, since it uses less digits than its factorization.

120165981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65620.

The product of its (nonzero) digits is 4320, while the sum is 33.

The square root of 120165981 is about 10962.0244936782. The cubic root of 120165981 is about 493.4697236214.

The spelling of 120165981 in words is "one hundred twenty million, one hundred sixty-five thousand, nine hundred eighty-one".