172116615 has 16 divisors (see below), whose sum is σ = 300422016. Its totient is φ = 83450400.

The previous prime is 172116601. The next prime is 172116617. The reversal of 172116615 is 516611271.

It is not a de Polignac number, because 172116615 - 2⁵ = 172116583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172116617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 521401 + ... + 521730.

It is an arithmetic number, because the mean of its divisors is an integer number (18776376).

Almost surely, 2^172116615 is an apocalyptic number.

172116615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

172116615 is a deficient number, since it is larger than the sum of its proper divisors (128305401).

172116615 is a wasteful number, since it uses less digits than its factorization.

172116615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043150.

The product of its digits is 2520, while the sum is 30.

The square root of 172116615 is about 13119.3222004797. The cubic root of 172116615 is about 556.2554325102.

Adding to 172116615 its reverse (516611271), we get a palindrome (688727886).

It can be divided in two parts, 1721 and 16615, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 172116615 in words is "one hundred seventy-two million, one hundred sixteen thousand, six hundred fifteen".