180861481 has 2 divisors, whose sum is σ = 180861482. Its totient is φ = 180861480.

The previous prime is 180861479. The next prime is 180861517. The reversal of 180861481 is 184168081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157251600 + 23609881 = 12540^2 + 4859^2 .

It is an emirp because it is prime and its reverse (184168081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 180861481 - 2¹ = 180861479 is a prime.

It is a super-2 number, since 2×180861481² = 65421750619026722, which contains 22 as substring.

Together with 180861479, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 180861481.

It is not a weakly prime, because it can be changed into another prime (180861431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90430740 + 90430741.

It is an arithmetic number, because the mean of its divisors is an integer number (90430741).

Almost surely, 2^180861481 is an apocalyptic number.

It is an amenable number.

180861481 is a deficient number, since it is larger than the sum of its proper divisors (1).

180861481 is an equidigital number, since it uses as much as digits as its factorization.

180861481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 180861481 is about 13448.4750436620. The cubic root of 180861481 is about 565.5209448545.

The spelling of 180861481 in words is "one hundred eighty million, eight hundred sixty-one thousand, four hundred eighty-one".