135891541 has 2 divisors, whose sum is σ = 135891542. Its totient is φ = 135891540.

The previous prime is 135891527. The next prime is 135891551. The reversal of 135891541 is 145198531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105144516 + 30747025 = 10254^2 + 5545^2 .

It is a cyclic number.

It is not a de Polignac number, because 135891541 - 2²⁷ = 1673813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135891541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135891551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67945770 + 67945771.

It is an arithmetic number, because the mean of its divisors is an integer number (67945771).

Almost surely, 2^135891541 is an apocalyptic number.

It is an amenable number.

135891541 is a deficient number, since it is larger than the sum of its proper divisors (1).

135891541 is an equidigital number, since it uses as much as digits as its factorization.

135891541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 37.

The square root of 135891541 is about 11657.2527209459. The cubic root of 135891541 is about 514.1195765643.

The spelling of 135891541 in words is "one hundred thirty-five million, eight hundred ninety-one thousand, five hundred forty-one".