913421323561 has 4 divisors (see below), whose sum is σ = 927054477712. Its totient is φ = 899788169412.

The previous prime is 913421323553. The next prime is 913421323579. The reversal of 913421323561 is 165323124319.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165323124319 = 62011 ⋅2666029.

It is a cyclic number.

It is not a de Polignac number, because 913421323561 - 2³ = 913421323553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (913421323511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6816576975 + ... + 6816577108.

It is an arithmetic number, because the mean of its divisors is an integer number (231763619428).

Almost surely, 2^913421323561 is an apocalyptic number.

It is an amenable number.

913421323561 is a deficient number, since it is larger than the sum of its proper divisors (13633154151).

913421323561 is a wasteful number, since it uses less digits than its factorization.

913421323561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13633154150.

The product of its digits is 116640, while the sum is 40.

The spelling of 913421323561 in words is "nine hundred thirteen billion, four hundred twenty-one million, three hundred twenty-three thousand, five hundred sixty-one".