180391 has 2 divisors, whose sum is σ = 180392. Its totient is φ = 180390.

The previous prime is 180379. The next prime is 180413. The reversal of 180391 is 193081.

It is an a-pointer prime, because the next prime (180413) can be obtained adding 180391 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 180391 - 2⁷ = 180263 is a prime.

180391 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90195 + 90196.

It is an arithmetic number, because the mean of its divisors is an integer number (90196).

2¹⁸⁰³⁹¹ is an apocalyptic number.

180391 is a deficient number, since it is larger than the sum of its proper divisors (1).

180391 is an equidigital number, since it uses as much as digits as its factorization.

180391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 180391 is about 424.7246166636. The cubic root of 180391 is about 56.5030149538.

The spelling of 180391 in words is "one hundred eighty thousand, three hundred ninety-one".