135521123 has 2 divisors, whose sum is σ = 135521124. Its totient is φ = 135521122.

The previous prime is 135521081. The next prime is 135521137. The reversal of 135521123 is 321125531.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135521123 - 2²⁶ = 68412259 is a prime.

It is a super-2 number, since 2×135521123² = 36731949558362258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (135521143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67760561 + 67760562.

It is an arithmetic number, because the mean of its divisors is an integer number (67760562).

Almost surely, 2^135521123 is an apocalyptic number.

135521123 is a deficient number, since it is larger than the sum of its proper divisors (1).

135521123 is an equidigital number, since it uses as much as digits as its factorization.

135521123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 23.

The square root of 135521123 is about 11641.3540020051. The cubic root of 135521123 is about 513.6520163279.

Adding to 135521123 its reverse (321125531), we get a palindrome (456646654).

The spelling of 135521123 in words is "one hundred thirty-five million, five hundred twenty-one thousand, one hundred twenty-three".