135719561 has 2 divisors, whose sum is σ = 135719562. Its totient is φ = 135719560.

The previous prime is 135719513. The next prime is 135719579. The reversal of 135719561 is 165917531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132963961 + 2755600 = 11531^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 135719561 - 2¹⁴ = 135703177 is a prime.

It is not a weakly prime, because it can be changed into another prime (135719161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67859780 + 67859781.

It is an arithmetic number, because the mean of its divisors is an integer number (67859781).

Almost surely, 2^135719561 is an apocalyptic number.

It is an amenable number.

135719561 is a deficient number, since it is larger than the sum of its proper divisors (1).

135719561 is an equidigital number, since it uses as much as digits as its factorization.

135719561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 38.

The square root of 135719561 is about 11649.8738619781. The cubic root of 135719561 is about 513.9026005598.

It can be divided in two parts, 13571 and 9561, that added together give a palindrome (23132).

The spelling of 135719561 in words is "one hundred thirty-five million, seven hundred nineteen thousand, five hundred sixty-one".