135801557 has 2 divisors, whose sum is σ = 135801558. Its totient is φ = 135801556.

The previous prime is 135801551. The next prime is 135801587. The reversal of 135801557 is 755108531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116079076 + 19722481 = 10774^2 + 4441^2 .

It is an emirp because it is prime and its reverse (755108531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135801557 - 2⁴ = 135801541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135801551) 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, 67900778 + 67900779.

It is an arithmetic number, because the mean of its divisors is an integer number (67900779).

Almost surely, 2^135801557 is an apocalyptic number.

It is an amenable number.

135801557 is a deficient number, since it is larger than the sum of its proper divisors (1).

135801557 is an equidigital number, since it uses as much as digits as its factorization.

135801557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 35.

The square root of 135801557 is about 11653.3925103379. The cubic root of 135801557 is about 514.0060724401.

The spelling of 135801557 in words is "one hundred thirty-five million, eight hundred one thousand, five hundred fifty-seven".