171900401 has 2 divisors, whose sum is σ = 171900402. Its totient is φ = 171900400.

The previous prime is 171900389. The next prime is 171900419. The reversal of 171900401 is 104009171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149328400 + 22572001 = 12220^2 + 4751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171900401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (171900431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85950200 + 85950201.

It is an arithmetic number, because the mean of its divisors is an integer number (85950201).

Almost surely, 2^171900401 is an apocalyptic number.

It is an amenable number.

171900401 is a deficient number, since it is larger than the sum of its proper divisors (1).

171900401 is an equidigital number, since it uses as much as digits as its factorization.

171900401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 171900401 is about 13111.0793224662. The cubic root of 171900401 is about 556.0224110232.

Adding to 171900401 its reverse (104009171), we get a palindrome (275909572).

The spelling of 171900401 in words is "one hundred seventy-one million, nine hundred thousand, four hundred one".