201351101561 has 2 divisors, whose sum is σ = 201351101562. Its totient is φ = 201351101560.

The previous prime is 201351101527. The next prime is 201351101569. The reversal of 201351101561 is 165101153102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190274802025 + 11076299536 = 436205^2 + 105244^2 .

It is a cyclic number.

It is not a de Polignac number, because 201351101561 - 2²⁶ = 201283992697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201351101561.

It is not a weakly prime, because it can be changed into another prime (201351101569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100675550780 + 100675550781.

It is an arithmetic number, because the mean of its divisors is an integer number (100675550781).

Almost surely, 2^201351101561 is an apocalyptic number.

It is an amenable number.

201351101561 is a deficient number, since it is larger than the sum of its proper divisors (1).

201351101561 is an equidigital number, since it uses as much as digits as its factorization.

201351101561 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 26.

Adding to 201351101561 its reverse (165101153102), we get a palindrome (366452254663).

The spelling of 201351101561 in words is "two hundred one billion, three hundred fifty-one million, one hundred one thousand, five hundred sixty-one".