201540601 has 2 divisors, whose sum is σ = 201540602. Its totient is φ = 201540600.

The previous prime is 201540587. The next prime is 201540643. The reversal of 201540601 is 106045102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169911225 + 31629376 = 13035^2 + 5624^2 .

It is a cyclic number.

It is not a de Polignac number, because 201540601 - 2⁵ = 201540569 is a prime.

It is a super-2 number, since 2×201540601² = 81237227702882402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201546601) 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, 100770300 + 100770301.

It is an arithmetic number, because the mean of its divisors is an integer number (100770301).

Almost surely, 2^201540601 is an apocalyptic number.

It is an amenable number.

201540601 is a deficient number, since it is larger than the sum of its proper divisors (1).

201540601 is an equidigital number, since it uses as much as digits as its factorization.

201540601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 201540601 is about 14196.4996037756. The cubic root of 201540601 is about 586.3012900451.

Adding to 201540601 its reverse (106045102), we get a palindrome (307585703).

The spelling of 201540601 in words is "two hundred one million, five hundred forty thousand, six hundred one".