172006691 has 2 divisors, whose sum is σ = 172006692. Its totient is φ = 172006690.

The previous prime is 172006669. The next prime is 172006721. The reversal of 172006691 is 196600271.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172006691 - 2¹⁰ = 172005667 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172056691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86003345 + 86003346.

It is an arithmetic number, because the mean of its divisors is an integer number (86003346).

Almost surely, 2^172006691 is an apocalyptic number.

172006691 is a deficient number, since it is larger than the sum of its proper divisors (1).

172006691 is an equidigital number, since it uses as much as digits as its factorization.

172006691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 172006691 is about 13115.1321381067. The cubic root of 172006691 is about 556.1369879236.

The spelling of 172006691 in words is "one hundred seventy-two million, six thousand, six hundred ninety-one".