135439456441 has 3 divisors (see below), whose sum is σ = 135439824463. Its totient is φ = 135439088420.

The previous prime is 135439456393. The next prime is 135439456447. The reversal of 135439456441 is 144654934531.

The square root of 135439456441 is 368021.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 144654934531 = 379 ⋅381675289.

It can be written as a sum of positive squares in only one way, i.e., 41791216041 + 93648240400 = 204429^2 + 306020^2 .

It is a de Polignac number, because none of the positive numbers 2^k-135439456441 is a prime.

It is a super-2 number, since 2×135439456441² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135439456447) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 184011 + ... + 552031.

Almost surely, 2^135439456441 is an apocalyptic number.

135439456441 is the 368021-st square number.

135439456441 is the 184011-st centered octagonal number.

It is an amenable number.

135439456441 is a deficient number, since it is larger than the sum of its proper divisors (368022).

135439456441 is an frugal number, since it uses more digits than its factorization.

135439456441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736042 (or 368021 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 49.

Multiplying 135439456441 by its sum of digits (49), we get a square (6636533365609 = 2576147²).

The spelling of 135439456441 in words is "one hundred thirty-five billion, four hundred thirty-nine million, four hundred fifty-six thousand, four hundred forty-one".