172220025 has 24 divisors (see below), whose sum is σ = 285517440. Its totient is φ = 91599040.

The previous prime is 172219991. The next prime is 172220033. The reversal of 172220025 is 520022271.

It is a happy number.

It is not a de Polignac number, because 172220025 - 2⁹ = 172219513 is a prime.

It is a super-2 number, since 2×172220025² = 59319474022001250, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 172219983 and 172220010.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26224 + ... + 32126.

It is an arithmetic number, because the mean of its divisors is an integer number (11896560).

Almost surely, 2^172220025 is an apocalyptic number.

172220025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172220025 is a deficient number, since it is larger than the sum of its proper divisors (113297415).

172220025 is a wasteful number, since it uses less digits than its factorization.

172220025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6305 (or 6300 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 172220025 is about 13123.2627421690. The cubic root of 172220025 is about 556.3668121467.

Adding to 172220025 its reverse (520022271), we get a palindrome (692242296).

The spelling of 172220025 in words is "one hundred seventy-two million, two hundred twenty thousand, twenty-five".