180639469 has 2 divisors, whose sum is σ = 180639470. Its totient is φ = 180639468.

The previous prime is 180639419. The next prime is 180639491. The reversal of 180639469 is 964936081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125731369 + 54908100 = 11213^2 + 7410^2 .

It is an emirp because it is prime and its reverse (964936081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 180639469 - 2⁷ = 180639341 is a prime.

It is a super-2 number, since 2×180639469² = 65261235521203922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180639419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90319734 + 90319735.

It is an arithmetic number, because the mean of its divisors is an integer number (90319735).

Almost surely, 2^180639469 is an apocalyptic number.

It is an amenable number.

180639469 is a deficient number, since it is larger than the sum of its proper divisors (1).

180639469 is an equidigital number, since it uses as much as digits as its factorization.

180639469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 180639469 is about 13440.2183390003. The cubic root of 180639469 is about 565.2894530644.

The spelling of 180639469 in words is "one hundred eighty million, six hundred thirty-nine thousand, four hundred sixty-nine".