135772523 has 4 divisors (see below), whose sum is σ = 143759160. Its totient is φ = 127785888.

The previous prime is 135772493. The next prime is 135772531. The reversal of 135772523 is 325277531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325277531 = 3259 ⋅99809.

It is a cyclic number.

It is not a de Polignac number, because 135772523 - 2⁶ = 135772459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135772123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3993293 + ... + 3993326.

It is an arithmetic number, because the mean of its divisors is an integer number (35939790).

Almost surely, 2^135772523 is an apocalyptic number.

135772523 is a deficient number, since it is larger than the sum of its proper divisors (7986637).

135772523 is an equidigital number, since it uses as much as digits as its factorization.

135772523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7986636.

The product of its digits is 44100, while the sum is 35.

The square root of 135772523 is about 11652.1467120870. The cubic root of 135772523 is about 513.9694388003.

The spelling of 135772523 in words is "one hundred thirty-five million, seven hundred seventy-two thousand, five hundred twenty-three".