172216526 has 4 divisors (see below), whose sum is σ = 258324792. Its totient is φ = 86108262.

The previous prime is 172216489. The next prime is 172216543. The reversal of 172216526 is 625612271.

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

It is a junction number, because it is equal to n+sod(n) for n = 172216492 and 172216501.

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 as a sum of consecutive naturals, namely, 43054130 + ... + 43054133.

It is an arithmetic number, because the mean of its divisors is an integer number (64581198).

Almost surely, 2^172216526 is an apocalyptic number.

172216526 is a deficient number, since it is larger than the sum of its proper divisors (86108266).

172216526 is an equidigital number, since it uses as much as digits as its factorization.

172216526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86108265.

The product of its digits is 10080, while the sum is 32.

The square root of 172216526 is about 13123.1294286081. The cubic root of 172216526 is about 556.3630442135.

Adding to 172216526 its reverse (625612271), we get a palindrome (797828797).

The spelling of 172216526 in words is "one hundred seventy-two million, two hundred sixteen thousand, five hundred twenty-six".