135123455 has 4 divisors (see below), whose sum is σ = 162148152. Its totient is φ = 108098760.

The previous prime is 135123433. The next prime is 135123491. The reversal of 135123455 is 554321531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 554321531 = 37 ⋅14981663.

It is a de Polignac number, because none of the positive numbers 2^k-135123455 is a prime.

It is a super-2 number, since 2×135123455² = 36516696182274050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13512341 + ... + 13512350.

It is an arithmetic number, because the mean of its divisors is an integer number (40537038).

Almost surely, 2^135123455 is an apocalyptic number.

135123455 is a deficient number, since it is larger than the sum of its proper divisors (27024697).

135123455 is an equidigital number, since it uses as much as digits as its factorization.

135123455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27024696.

The product of its digits is 9000, while the sum is 29.

The square root of 135123455 is about 11624.2614819179. The cubic root of 135123455 is about 513.1491104938.

Adding to 135123455 its reverse (554321531), we get a palindrome (689444986).

The spelling of 135123455 in words is "one hundred thirty-five million, one hundred twenty-three thousand, four hundred fifty-five".