180921331 has 2 divisors, whose sum is σ = 180921332. Its totient is φ = 180921330.

The previous prime is 180921319. The next prime is 180921337. The reversal of 180921331 is 133129081.

It is a strong prime.

It is an emirp because it is prime and its reverse (133129081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 180921331 - 2⁷ = 180921203 is a prime.

It is a super-2 number, since 2×180921331² = 65465056021623122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 180921331.

It is not a weakly prime, because it can be changed into another prime (180921337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90460665 + 90460666.

It is an arithmetic number, because the mean of its divisors is an integer number (90460666).

Almost surely, 2^180921331 is an apocalyptic number.

180921331 is a deficient number, since it is larger than the sum of its proper divisors (1).

180921331 is an equidigital number, since it uses as much as digits as its factorization.

180921331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 180921331 is about 13450.7000189581. The cubic root of 180921331 is about 565.5833179952.

The spelling of 180921331 in words is "one hundred eighty million, nine hundred twenty-one thousand, three hundred thirty-one".