172344391 has 2 divisors, whose sum is σ = 172344392. Its totient is φ = 172344390.

The previous prime is 172344379. The next prime is 172344413. The reversal of 172344391 is 193443271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172344391 - 2¹¹ = 172342343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172344311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86172195 + 86172196.

It is an arithmetic number, because the mean of its divisors is an integer number (86172196).

Almost surely, 2^172344391 is an apocalyptic number.

172344391 is a deficient number, since it is larger than the sum of its proper divisors (1).

172344391 is an equidigital number, since it uses as much as digits as its factorization.

172344391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 172344391 is about 13128.0002666057. Note that the first 3 decimals coincide. The cubic root of 172344391 is about 556.5007037892.

The spelling of 172344391 in words is "one hundred seventy-two million, three hundred forty-four thousand, three hundred ninety-one".