180107981 has 2 divisors, whose sum is σ = 180107982. Its totient is φ = 180107980.

The previous prime is 180107969. The next prime is 180107987. The reversal of 180107981 is 189701081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158634025 + 21473956 = 12595^2 + 4634^2 .

It is a cyclic number.

It is not a de Polignac number, because 180107981 - 2²² = 175913677 is a prime.

It is a super-2 number, since 2×180107981² = 64877769639792722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180107987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90053990 + 90053991.

It is an arithmetic number, because the mean of its divisors is an integer number (90053991).

Almost surely, 2^180107981 is an apocalyptic number.

It is an amenable number.

180107981 is a deficient number, since it is larger than the sum of its proper divisors (1).

180107981 is an equidigital number, since it uses as much as digits as its factorization.

180107981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 180107981 is about 13420.4314759251. The cubic root of 180107981 is about 564.7344992164.

The spelling of 180107981 in words is "one hundred eighty million, one hundred seven thousand, nine hundred eighty-one".