135185505581531 has 2 divisors, whose sum is σ = 135185505581532. Its totient is φ = 135185505581530.

The previous prime is 135185505581461. The next prime is 135185505581537.

135185505581531 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 135185505581531 - 2³⁰ = 135184431839707 is a prime.

It is a super-2 number, since 2×135185505581531² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (135185505581537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67592752790765 + 67592752790766.

It is an arithmetic number, because the mean of its divisors is an integer number (67592752790766).

Almost surely, 2^{135185505581531} is an apocalyptic number.

135185505581531 is a deficient number, since it is larger than the sum of its proper divisors (1).

135185505581531 is an equidigital number, since it uses as much as digits as its factorization.

135185505581531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000000, while the sum is 56.

The spelling of 135185505581531 in words is "one hundred thirty-five trillion, one hundred eighty-five billion, five hundred five million, five hundred eighty-one thousand, five hundred thirty-one".