9513393121 has 4 divisors (see below), whose sum is σ = 9770511892. Its totient is φ = 9256274352.

The previous prime is 9513393107. The next prime is 9513393133. The reversal of 9513393121 is 1213933159.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1213933159 = 839 ⋅1446881.

It can be written as a sum of positive squares in 2 ways, for example, as 9022150225 + 491242896 = 94985^2 + 22164^2 .

It is a cyclic number.

It is not a de Polignac number, because 9513393121 - 2¹⁷ = 9513262049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 257118733 = 9513393121 / (9 + 5 + 1 + 3 + 3 + 9 + 3 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9513393161) 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, 128559330 + ... + 128559403.

It is an arithmetic number, because the mean of its divisors is an integer number (2442627973).

Almost surely, 2^9513393121 is an apocalyptic number.

It is an amenable number.

9513393121 is a deficient number, since it is larger than the sum of its proper divisors (257118771).

9513393121 is a wasteful number, since it uses less digits than its factorization.

9513393121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257118770.

The product of its digits is 21870, while the sum is 37.

The square root of 9513393121 is about 97536.6245110010. The cubic root of 9513393121 is about 2118.9066036867.

The spelling of 9513393121 in words is "nine billion, five hundred thirteen million, three hundred ninety-three thousand, one hundred twenty-one".