135379379581 has 2 divisors, whose sum is σ = 135379379582. Its totient is φ = 135379379580.

The previous prime is 135379379477. The next prime is 135379379599. The reversal of 135379379581 is 185973973531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135301851556 + 77528025 = 367834^2 + 8805^2 .

It is a cyclic number.

It is not a de Polignac number, because 135379379581 - 2²⁵ = 135345825149 is a prime.

It is a super-2 number, since 2×135379379581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135379379381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67689689790 + 67689689791.

It is an arithmetic number, because the mean of its divisors is an integer number (67689689791).

Almost surely, 2^135379379581 is an apocalyptic number.

It is an amenable number.

135379379581 is a deficient number, since it is larger than the sum of its proper divisors (1).

135379379581 is an equidigital number, since it uses as much as digits as its factorization.

135379379581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21432600, while the sum is 61.

The spelling of 135379379581 in words is "one hundred thirty-five billion, three hundred seventy-nine million, three hundred seventy-nine thousand, five hundred eighty-one".