172134409 has 2 divisors, whose sum is σ = 172134410. Its totient is φ = 172134408.

The previous prime is 172134373. The next prime is 172134421. The reversal of 172134409 is 904431271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172134400 + 9 = 13120^2 + 3^2 .

It is an emirp because it is prime and its reverse (904431271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172134409 - 2²³ = 163745801 is a prime.

It is not a weakly prime, because it can be changed into another prime (172134499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86067204 + 86067205.

It is an arithmetic number, because the mean of its divisors is an integer number (86067205).

Almost surely, 2^172134409 is an apocalyptic number.

It is an amenable number.

172134409 is a deficient number, since it is larger than the sum of its proper divisors (1).

172134409 is an equidigital number, since it uses as much as digits as its factorization.

172134409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 172134409 is about 13120.0003429878. Note that the first 3 decimals coincide. The cubic root of 172134409 is about 556.2746010413.

The spelling of 172134409 in words is "one hundred seventy-two million, one hundred thirty-four thousand, four hundred nine".