172348409 has 2 divisors, whose sum is σ = 172348410. Its totient is φ = 172348408.

The previous prime is 172348369. The next prime is 172348417. The reversal of 172348409 is 904843271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160098409 + 12250000 = 12653^2 + 3500^2 .

It is a cyclic number.

It is not a de Polignac number, because 172348409 - 2⁸ = 172348153 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (172348439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86174204 + 86174205.

It is an arithmetic number, because the mean of its divisors is an integer number (86174205).

Almost surely, 2^172348409 is an apocalyptic number.

It is an amenable number.

172348409 is a deficient number, since it is larger than the sum of its proper divisors (1).

172348409 is an equidigital number, since it uses as much as digits as its factorization.

172348409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 172348409 is about 13128.1532973987. The cubic root of 172348409 is about 556.5050284681.

The spelling of 172348409 in words is "one hundred seventy-two million, three hundred forty-eight thousand, four hundred nine".