9213573881 has 4 divisors (see below), whose sum is σ = 9213827700. Its totient is φ = 9213320064.

The previous prime is 9213573823. The next prime is 9213573899. The reversal of 9213573881 is 1883753129.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1883753129 = 521 ⋅3615649.

It can be written as a sum of positive squares in 2 ways, for example, as 8489963881 + 723610000 = 92141^2 + 26900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9213573881 is a prime.

It is a super-2 number, since 2×9213573881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9213573821) 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, 61076 + ... + 148853.

It is an arithmetic number, because the mean of its divisors is an integer number (2303456925).

Almost surely, 2^9213573881 is an apocalyptic number.

It is an amenable number.

9213573881 is a deficient number, since it is larger than the sum of its proper divisors (253819).

9213573881 is a wasteful number, since it uses less digits than its factorization.

9213573881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253818.

The product of its digits is 362880, while the sum is 47.

The square root of 9213573881 is about 95987.3631318206. The cubic root of 9213573881 is about 2096.4091226441.

The spelling of 9213573881 in words is "nine billion, two hundred thirteen million, five hundred seventy-three thousand, eight hundred eighty-one".