228156525 has 18 divisors (see below), whose sum is σ = 408654090. Its totient is φ = 121683360.

The previous prime is 228156521. The next prime is 228156529. The reversal of 228156525 is 525651822.

It is a happy number.

228156525 is a `hidden beast` number, since 2 + 2 + 81 + 56 + 525 = 666.

It is an interprime number because it is at equal distance from previous prime (228156521) and next prime (228156529).

It can be written as a sum of positive squares in 3 ways, for example, as 12595401 + 215561124 = 3549^2 + 14682^2 .

It is not a de Polignac number, because 228156525 - 2² = 228156521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 228156525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228156521) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 506790 + ... + 507239.

It is an arithmetic number, because the mean of its divisors is an integer number (22703005).

Almost surely, 2^228156525 is an apocalyptic number.

228156525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

228156525 is a deficient number, since it is larger than the sum of its proper divisors (180497565).

228156525 is a wasteful number, since it uses less digits than its factorization.

228156525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014045 (or 1014037 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 228156525 is about 15104.8510419666. The cubic root of 228156525 is about 611.0512420382.

The spelling of 228156525 in words is "two hundred twenty-eight million, one hundred fifty-six thousand, five hundred twenty-five".