201525521 has 2 divisors, whose sum is σ = 201525522. Its totient is φ = 201525520.

The previous prime is 201525503. The next prime is 201525547. The reversal of 201525521 is 125525102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154753600 + 46771921 = 12440^2 + 6839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201525521 is a prime.

It is a super-2 number, since 2×201525521² = 81225071228642882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (201525721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100762760 + 100762761.

It is an arithmetic number, because the mean of its divisors is an integer number (100762761).

Almost surely, 2^201525521 is an apocalyptic number.

It is an amenable number.

201525521 is a deficient number, since it is larger than the sum of its proper divisors (1).

201525521 is an equidigital number, since it uses as much as digits as its factorization.

201525521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 201525521 is about 14195.9684770008. The cubic root of 201525521 is about 586.2866666162.

The spelling of 201525521 in words is "two hundred one million, five hundred twenty-five thousand, five hundred twenty-one".