172553191 has 2 divisors, whose sum is σ = 172553192. Its totient is φ = 172553190.

The previous prime is 172553189. The next prime is 172553197. The reversal of 172553191 is 191355271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172553191 - 2¹ = 172553189 is a prime.

Together with 172553189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172553197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86276595 + 86276596.

It is an arithmetic number, because the mean of its divisors is an integer number (86276596).

Almost surely, 2^172553191 is an apocalyptic number.

172553191 is a deficient number, since it is larger than the sum of its proper divisors (1).

172553191 is an equidigital number, since it uses as much as digits as its factorization.

172553191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9450, while the sum is 34.

The square root of 172553191 is about 13135.9503272508. The cubic root of 172553191 is about 556.7253517598.

The spelling of 172553191 in words is "one hundred seventy-two million, five hundred fifty-three thousand, one hundred ninety-one".