17980381 has 2 divisors, whose sum is σ = 17980382. Its totient is φ = 17980380.

The previous prime is 17980379. The next prime is 17980423. The reversal of 17980381 is 18308971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14212900 + 3767481 = 3770^2 + 1941^2 .

It is a cyclic number.

It is not a de Polignac number, because 17980381 - 2¹ = 17980379 is a prime.

It is a super-2 number, since 2×17980381² = 646588201810322, which contains 22 as substring.

Together with 17980379, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 17980381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17980301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8990190 + 8990191.

It is an arithmetic number, because the mean of its divisors is an integer number (8990191).

Almost surely, 2^17980381 is an apocalyptic number.

It is an amenable number.

17980381 is a deficient number, since it is larger than the sum of its proper divisors (1).

17980381 is an equidigital number, since it uses as much as digits as its factorization.

17980381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 17980381 is about 4240.3279354314. The cubic root of 17980381 is about 261.9788893893.

The spelling of 17980381 in words is "seventeen million, nine hundred eighty thousand, three hundred eighty-one".