172212145 has 8 divisors (see below), whose sum is σ = 236176704. Its totient is φ = 118088304.

The previous prime is 172212101. The next prime is 172212149. The reversal of 172212145 is 541212271.

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

It is a cyclic number.

It is not a de Polignac number, because 172212145 - 2¹³ = 172203953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172212149) 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, 2460139 + ... + 2460208.

It is an arithmetic number, because the mean of its divisors is an integer number (29522088).

Almost surely, 2^172212145 is an apocalyptic number.

It is an amenable number.

172212145 is a deficient number, since it is larger than the sum of its proper divisors (63964559).

172212145 is an equidigital number, since it uses as much as digits as its factorization.

172212145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4920359.

The product of its digits is 1120, while the sum is 25.

The square root of 172212145 is about 13122.9625085192. The cubic root of 172212145 is about 556.3583264177.

The spelling of 172212145 in words is "one hundred seventy-two million, two hundred twelve thousand, one hundred forty-five".