172145025 has 72 divisors (see below), whose sum is σ = 334796280. Its totient is φ = 84049920.

The previous prime is 172144981. The next prime is 172145069. The reversal of 172145025 is 520541271.

It is an interprime number because it is at equal distance from previous prime (172144981) and next prime (172145069).

It can be written as a sum of positive squares in 12 ways, for example, as 3326976 + 168818049 = 1824^2 + 12993^2 .

It is not a de Polignac number, because 172145025 - 2⁶ = 172144961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172145025.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 669697 + ... + 669953.

Almost surely, 2^172145025 is an apocalyptic number.

172145025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172145025 is a deficient number, since it is larger than the sum of its proper divisors (162651255).

172145025 is a wasteful number, since it uses less digits than its factorization.

172145025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515 (or 507 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 172145025 is about 13120.4049099104. The cubic root of 172145025 is about 556.2860364652.

Adding to 172145025 its reverse (520541271), we get a palindrome (692686296).

The spelling of 172145025 in words is "one hundred seventy-two million, one hundred forty-five thousand, twenty-five".