172214605 has 4 divisors (see below), whose sum is σ = 206657532. Its totient is φ = 137771680.

The previous prime is 172214597. The next prime is 172214611. The reversal of 172214605 is 506412271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22250089 + 149964516 = 4717^2 + 12246^2 .

It is not a de Polignac number, because 172214605 - 2³ = 172214597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 17221456 + ... + 17221465.

It is an arithmetic number, because the mean of its divisors is an integer number (51664383).

Almost surely, 2^172214605 is an apocalyptic number.

It is an amenable number.

172214605 is a deficient number, since it is larger than the sum of its proper divisors (34442927).

172214605 is an equidigital number, since it uses as much as digits as its factorization.

172214605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34442926.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 172214605 is about 13123.0562370204. The cubic root of 172214605 is about 556.3609755437.

Adding to 172214605 its reverse (506412271), we get a palindrome (678626876).

The spelling of 172214605 in words is "one hundred seventy-two million, two hundred fourteen thousand, six hundred five".