135439296589921 has 27 divisors (see below), whose sum is σ = 142011995724081. Its totient is φ = 129160182022344.

The previous prime is 135439296589913. The next prime is 135439296589951. The reversal of 135439296589921 is 129985692934531.

The square root of 135439296589921 is 11637839.

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

It is not a de Polignac number, because 135439296589921 - 2³ = 135439296589913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135439296589901) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 130355434120 + ... + 130355435158.

Almost surely, 2^{135439296589921} is an apocalyptic number.

135439296589921 is the 11637839-th square number.

135439296589921 is the 5818920-th centered octagonal number.

It is an amenable number.

135439296589921 is a deficient number, since it is larger than the sum of its proper divisors (6572699134160).

135439296589921 is an frugal number, since it uses more digits than its factorization.

135439296589921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3098 (or 1549 counting only the distinct ones).

The product of its digits is 1133740800, while the sum is 76.

The spelling of 135439296589921 in words is "one hundred thirty-five trillion, four hundred thirty-nine billion, two hundred ninety-six million, five hundred eighty-nine thousand, nine hundred twenty-one".