120686981 has 2 divisors, whose sum is σ = 120686982. Its totient is φ = 120686980.

The previous prime is 120686977. The next prime is 120686983. The reversal of 120686981 is 189686021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91968100 + 28718881 = 9590^2 + 5359^2 .

It is a cyclic number.

It is not a de Polignac number, because 120686981 - 2² = 120686977 is a prime.

It is a super-2 number, since 2×120686981² = 29130694765788722, which contains 22 as substring.

Together with 120686983, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_6878525 and since 120686981 and 6878525 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120686983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60343490 + 60343491.

It is an arithmetic number, because the mean of its divisors is an integer number (60343491).

Almost surely, 2^120686981 is an apocalyptic number.

It is an amenable number.

120686981 is a deficient number, since it is larger than the sum of its proper divisors (1).

120686981 is an equidigital number, since it uses as much as digits as its factorization.

120686981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 120686981 is about 10985.7626499028. The cubic root of 120686981 is about 494.1818693071.

The spelling of 120686981 in words is "one hundred twenty million, six hundred eighty-six thousand, nine hundred eighty-one".