201538969 has 2 divisors, whose sum is σ = 201538970. Its totient is φ = 201538968.

The previous prime is 201538943. The next prime is 201538973. The reversal of 201538969 is 969835102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139523344 + 62015625 = 11812^2 + 7875^2 .

It is a cyclic number.

It is not a de Polignac number, because 201538969 - 2⁹ = 201538457 is a prime.

It is a super-2 number, since 2×201538969² = 81235912051165922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201538369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100769484 + 100769485.

It is an arithmetic number, because the mean of its divisors is an integer number (100769485).

Almost surely, 2^201538969 is an apocalyptic number.

It is an amenable number.

201538969 is a deficient number, since it is larger than the sum of its proper divisors (1).

201538969 is an equidigital number, since it uses as much as digits as its factorization.

201538969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 201538969 is about 14196.4421247015. The cubic root of 201538969 is about 586.2997074917.

The spelling of 201538969 in words is "two hundred one million, five hundred thirty-eight thousand, nine hundred sixty-nine".