173694421 has 2 divisors, whose sum is σ = 173694422. Its totient is φ = 173694420.

The previous prime is 173694397. The next prime is 173694431. The reversal of 173694421 is 124496371.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158004900 + 15689521 = 12570^2 + 3961^2 .

It is a cyclic number.

It is not a de Polignac number, because 173694421 - 2⁹ = 173693909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173694431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86847210 + 86847211.

It is an arithmetic number, because the mean of its divisors is an integer number (86847211).

Almost surely, 2^173694421 is an apocalyptic number.

It is an amenable number.

173694421 is a deficient number, since it is larger than the sum of its proper divisors (1).

173694421 is an equidigital number, since it uses as much as digits as its factorization.

173694421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 173694421 is about 13179.3179262054. The cubic root of 173694421 is about 557.9500100812.

The spelling of 173694421 in words is "one hundred seventy-three million, six hundred ninety-four thousand, four hundred twenty-one".