173390381 has 2 divisors, whose sum is σ = 173390382. Its totient is φ = 173390380.

The previous prime is 173390369. The next prime is 173390383. The reversal of 173390381 is 183093371.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150675625 + 22714756 = 12275^2 + 4766^2 .

It is a cyclic number.

It is not a de Polignac number, because 173390381 - 2⁶ = 173390317 is a prime.

It is a super-2 number, since 2×173390381² = 60128448446650322, which contains 22 as substring.

Together with 173390383, 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 (173390383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86695190 + 86695191.

It is an arithmetic number, because the mean of its divisors is an integer number (86695191).

Almost surely, 2^173390381 is an apocalyptic number.

It is an amenable number.

173390381 is a deficient number, since it is larger than the sum of its proper divisors (1).

173390381 is an equidigital number, since it uses as much as digits as its factorization.

173390381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 173390381 is about 13167.7781345222. The cubic root of 173390381 is about 557.6242690529.

The spelling of 173390381 in words is "one hundred seventy-three million, three hundred ninety thousand, three hundred eighty-one".