172515047 has 2 divisors, whose sum is σ = 172515048. Its totient is φ = 172515046.

The previous prime is 172515043. The next prime is 172515071. The reversal of 172515047 is 740515271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172515047 - 2² = 172515043 is a prime.

It is a super-2 number, since 2×172515047² = 59522882882824418, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172515043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86257523 + 86257524.

It is an arithmetic number, because the mean of its divisors is an integer number (86257524).

Almost surely, 2^172515047 is an apocalyptic number.

172515047 is a deficient number, since it is larger than the sum of its proper divisors (1).

172515047 is an equidigital number, since it uses as much as digits as its factorization.

172515047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 172515047 is about 13134.4983535725. The cubic root of 172515047 is about 556.6843261556.

The spelling of 172515047 in words is "one hundred seventy-two million, five hundred fifteen thousand, forty-seven".