171972097 has 36 divisors (see below), whose sum is σ = 207556608. Its totient is φ = 142203600.

The previous prime is 171972083. The next prime is 171972113. The reversal of 171972097 is 790279171.

It is not a de Polignac number, because 171972097 - 2²³ = 163583489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171972797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1354048 + ... + 1354174.

Almost surely, 2^171972097 is an apocalyptic number.

It is an amenable number.

171972097 is a deficient number, since it is larger than the sum of its proper divisors (35584511).

171972097 is a wasteful number, since it uses less digits than its factorization.

171972097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 55566, while the sum is 43.

The square root of 171972097 is about 13113.8132135546. The cubic root of 171972097 is about 556.0997019848.

The spelling of 171972097 in words is "one hundred seventy-one million, nine hundred seventy-two thousand, ninety-seven".