180923021 has 2 divisors, whose sum is σ = 180923022. Its totient is φ = 180923020.

The previous prime is 180923009. The next prime is 180923023. The reversal of 180923021 is 120329081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153412996 + 27510025 = 12386^2 + 5245^2 .

It is an emirp because it is prime and its reverse (120329081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 180923021 - 2²⁶ = 113814157 is a prime.

Together with 180923023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180923023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90461510 + 90461511.

It is an arithmetic number, because the mean of its divisors is an integer number (90461511).

Almost surely, 2^180923021 is an apocalyptic number.

It is an amenable number.

180923021 is a deficient number, since it is larger than the sum of its proper divisors (1).

180923021 is an equidigital number, since it uses as much as digits as its factorization.

180923021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 180923021 is about 13450.7628408206. The cubic root of 180923021 is about 565.5850790420.

The spelling of 180923021 in words is "one hundred eighty million, nine hundred twenty-three thousand, twenty-one".