172688471 has 2 divisors, whose sum is σ = 172688472. Its totient is φ = 172688470.

The previous prime is 172688459. The next prime is 172688479. The reversal of 172688471 is 174886271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172688471 - 2⁶ = 172688407 is a prime.

It is a super-3 number, since 3×172688471³ (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 (172688479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86344235 + 86344236.

It is an arithmetic number, because the mean of its divisors is an integer number (86344236).

Almost surely, 2^172688471 is an apocalyptic number.

172688471 is a deficient number, since it is larger than the sum of its proper divisors (1).

172688471 is an equidigital number, since it uses as much as digits as its factorization.

172688471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 44.

The square root of 172688471 is about 13141.0985461642. The cubic root of 172688471 is about 556.8708028175.

The spelling of 172688471 in words is "one hundred seventy-two million, six hundred eighty-eight thousand, four hundred seventy-one".