172420525 has 12 divisors (see below), whose sum is σ = 216732532. Its totient is φ = 136045440.

The previous prime is 172420519. The next prime is 172420537. The reversal of 172420525 is 525024271.

It can be written as a sum of positive squares in 6 ways, for example, as 6165289 + 166255236 = 2483^2 + 12894^2 .

It is not a de Polignac number, because 172420525 - 2³ = 172420517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172420493 and 172420502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45414 + ... + 49063.

Almost surely, 2^172420525 is an apocalyptic number.

It is an amenable number.

172420525 is a deficient number, since it is larger than the sum of its proper divisors (44312007).

172420525 is an equidigital number, since it uses as much as digits as its factorization.

172420525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94560 (or 94555 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 172420525 is about 13130.8996264536. The cubic root of 172420525 is about 556.5826373855.

Adding to 172420525 its reverse (525024271), we get a palindrome (697444796).

The spelling of 172420525 in words is "one hundred seventy-two million, four hundred twenty thousand, five hundred twenty-five".