134428761223991 has 4 divisors (see below), whose sum is σ = 144769435164312. Its totient is φ = 124088087283672.

The previous prime is 134428761223973. The next prime is 134428761224027. The reversal of 134428761223991 is 199322167824431.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 134428761223991 - 2²⁶ = 134428694115127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134428761223961) 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, 5170336970141 + ... + 5170336970166.

It is an arithmetic number, because the mean of its divisors is an integer number (36192358791078).

Almost surely, 2^{134428761223991} is an apocalyptic number.

134428761223991 is a deficient number, since it is larger than the sum of its proper divisors (10340673940321).

134428761223991 is a wasteful number, since it uses less digits than its factorization.

134428761223991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10340673940320.

The product of its digits is 31352832, while the sum is 62.

The spelling of 134428761223991 in words is "one hundred thirty-four trillion, four hundred twenty-eight billion, seven hundred sixty-one million, two hundred twenty-three thousand, nine hundred ninety-one".