172097191 has 8 divisors (see below), whose sum is σ = 196986240. Its totient is φ = 147284088.

The previous prime is 172097179. The next prime is 172097197. The reversal of 172097191 is 191790271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 172097191 - 2⁹ = 172096679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172097191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172097197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14041 + ... + 23266.

It is an arithmetic number, because the mean of its divisors is an integer number (24623280).

Almost surely, 2^172097191 is an apocalyptic number.

172097191 is a deficient number, since it is larger than the sum of its proper divisors (24889049).

172097191 is an equidigital number, since it uses as much as digits as its factorization.

172097191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37973.

The product of its (nonzero) digits is 7938, while the sum is 37.

The square root of 172097191 is about 13118.5818974461. The cubic root of 172097191 is about 556.2345065583.

The spelling of 172097191 in words is "one hundred seventy-two million, ninety-seven thousand, one hundred ninety-one".