228521525 has 6 divisors (see below), whose sum is σ = 283366722. Its totient is φ = 182817200.

The previous prime is 228521519. The next prime is 228521533. The reversal of 228521525 is 525125822.

It can be written as a sum of positive squares in 3 ways, for example, as 26853124 + 201668401 = 5182^2 + 14201^2 .

It is not a de Polignac number, because 228521525 - 2⁸ = 228521269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 228521491 and 228521500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4570406 + ... + 4570455.

It is an arithmetic number, because the mean of its divisors is an integer number (47227787).

Almost surely, 2^228521525 is an apocalyptic number.

228521525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

228521525 is a deficient number, since it is larger than the sum of its proper divisors (54845197).

228521525 is an equidigital number, since it uses as much as digits as its factorization.

228521525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9140871 (or 9140866 counting only the distinct ones).

The product of its digits is 16000, while the sum is 32.

The square root of 228521525 is about 15116.9284247826. The cubic root of 228521525 is about 611.3769173965.

The spelling of 228521525 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, five hundred twenty-five".