180995021 has 2 divisors, whose sum is σ = 180995022. Its totient is φ = 180995020.

The previous prime is 180994967. The next prime is 180995123. The reversal of 180995021 is 120599081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121242121 + 59752900 = 11011^2 + 7730^2 .

It is a cyclic number.

It is not a de Polignac number, because 180995021 - 2¹⁰ = 180993997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180995621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90497510 + 90497511.

It is an arithmetic number, because the mean of its divisors is an integer number (90497511).

Almost surely, 2^180995021 is an apocalyptic number.

It is an amenable number.

180995021 is a deficient number, since it is larger than the sum of its proper divisors (1).

180995021 is an equidigital number, since it uses as much as digits as its factorization.

180995021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 180995021 is about 13453.4390027234. The cubic root of 180995021 is about 565.6600957070.

The spelling of 180995021 in words is "one hundred eighty million, nine hundred ninety-five thousand, twenty-one".