172207491 has 16 divisors (see below), whose sum is σ = 232919808. Its totient is φ = 113162400.

The previous prime is 172207471. The next prime is 172207523. The reversal of 172207491 is 194702271.

It is not a de Polignac number, because 172207491 - 2⁷ = 172207363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172207411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60306 + ... + 63096.

It is an arithmetic number, because the mean of its divisors is an integer number (14557488).

Almost surely, 2^172207491 is an apocalyptic number.

172207491 is a deficient number, since it is larger than the sum of its proper divisors (60712317).

172207491 is a wasteful number, since it uses less digits than its factorization.

172207491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 172207491 is about 13122.7851845559. The cubic root of 172207491 is about 556.3533145471.

The spelling of 172207491 in words is "one hundred seventy-two million, two hundred seven thousand, four hundred ninety-one".