201525109 has 2 divisors, whose sum is σ = 201525110. Its totient is φ = 201525108.

The previous prime is 201525083. The next prime is 201525113. The reversal of 201525109 is 901525102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183060900 + 18464209 = 13530^2 + 4297^2 .

It is a cyclic number.

It is not a de Polignac number, because 201525109 - 2²¹ = 199427957 is a prime.

It is a super-2 number, since 2×201525109² = 81224739114923762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201525169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100762554 + 100762555.

It is an arithmetic number, because the mean of its divisors is an integer number (100762555).

Almost surely, 2^201525109 is an apocalyptic number.

It is an amenable number.

201525109 is a deficient number, since it is larger than the sum of its proper divisors (1).

201525109 is an equidigital number, since it uses as much as digits as its factorization.

201525109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 201525109 is about 14195.9539658313. The cubic root of 201525109 is about 586.2862670799.

The spelling of 201525109 in words is "two hundred one million, five hundred twenty-five thousand, one hundred nine".