9181639013 has 4 divisors (see below), whose sum is σ = 9181930860. Its totient is φ = 9181347168.

The previous prime is 9181639007. The next prime is 9181639043. The reversal of 9181639013 is 3109361819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3109361819 = 193 ⋅16110683.

It can be written as a sum of positive squares in 2 ways, for example, as 3487729249 + 5693909764 = 59057^2 + 75458^2 .

It is a cyclic number.

It is not a de Polignac number, because 9181639013 - 2¹⁴ = 9181622629 is a prime.

It is a super-2 number, since 2×9181639013² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9181639043) 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, 92120 + ... + 163857.

It is an arithmetic number, because the mean of its divisors is an integer number (2295482715).

Almost surely, 2^9181639013 is an apocalyptic number.

It is an amenable number.

9181639013 is a deficient number, since it is larger than the sum of its proper divisors (291847).

9181639013 is a wasteful number, since it uses less digits than its factorization.

9181639013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291846.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 9181639013 is about 95820.8694022341. The cubic root of 9181639013 is about 2093.9842204236.

The spelling of 9181639013 in words is "nine billion, one hundred eighty-one million, six hundred thirty-nine thousand, thirteen".