172291229 has 8 divisors (see below), whose sum is σ = 196126272. Its totient is φ = 149818240.

The previous prime is 172291193. The next prime is 172291241. The reversal of 172291229 is 922192271.

172291229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 172291229 - 2⁸ = 172290973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172291289) 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, 340244 + ... + 340749.

It is an arithmetic number, because the mean of its divisors is an integer number (24515784).

Almost surely, 2^172291229 is an apocalyptic number.

It is an amenable number.

172291229 is a deficient number, since it is larger than the sum of its proper divisors (23835043).

172291229 is a wasteful number, since it uses less digits than its factorization.

172291229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681027.

The product of its digits is 9072, while the sum is 35.

The square root of 172291229 is about 13125.9753542356. The cubic root of 172291229 is about 556.4434778037.

The spelling of 172291229 in words is "one hundred seventy-two million, two hundred ninety-one thousand, two hundred twenty-nine".