201231136453541 has 2 divisors, whose sum is σ = 201231136453542. Its totient is φ = 201231136453540.

The previous prime is 201231136453513. The next prime is 201231136453577. The reversal of 201231136453541 is 145354631132102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162885132921316 + 38346003532225 = 12762646^2 + 6192415^2 .

It is a cyclic number.

It is not a de Polignac number, because 201231136453541 - 2¹⁴ = 201231136437157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201231136453511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100615568226770 + 100615568226771.

It is an arithmetic number, because the mean of its divisors is an integer number (100615568226771).

Almost surely, 2^{201231136453541} is an apocalyptic number.

It is an amenable number.

201231136453541 is a deficient number, since it is larger than the sum of its proper divisors (1).

201231136453541 is an equidigital number, since it uses as much as digits as its factorization.

201231136453541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 41.

Adding to 201231136453541 its reverse (145354631132102), we get a palindrome (346585767585643).

The spelling of 201231136453541 in words is "two hundred one trillion, two hundred thirty-one billion, one hundred thirty-six million, four hundred fifty-three thousand, five hundred forty-one".