172289471 has 2 divisors, whose sum is σ = 172289472. Its totient is φ = 172289470.

The previous prime is 172289461. The next prime is 172289477. The reversal of 172289471 is 174982271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172289471 is a prime.

It is a super-3 number, since 3×172289471³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172289477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86144735 + 86144736.

It is an arithmetic number, because the mean of its divisors is an integer number (86144736).

Almost surely, 2^172289471 is an apocalyptic number.

172289471 is a deficient number, since it is larger than the sum of its proper divisors (1).

172289471 is an equidigital number, since it uses as much as digits as its factorization.

172289471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 41.

The square root of 172289471 is about 13125.9083876126. The cubic root of 172289471 is about 556.4415852118.

The spelling of 172289471 in words is "one hundred seventy-two million, two hundred eighty-nine thousand, four hundred seventy-one".