9181379961 has 24 divisors (see below), whose sum is σ = 14774639880. Its totient is φ = 5455247616.

The previous prime is 9181379869. The next prime is 9181379989. The reversal of 9181379961 is 1699731819.

It is a happy number.

9181379961 is a `hidden beast` number, since 9 + 181 + 379 + 96 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 152769600 + 9028610361 = 12360^2 + 95019^2 .

It is not a de Polignac number, because 9181379961 - 2¹⁰ = 9181378937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9181379898 and 9181379907.

It is not an unprimeable number, because it can be changed into a prime (9181379161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1349596 + ... + 1356381.

It is an arithmetic number, because the mean of its divisors is an integer number (615609995).

Almost surely, 2^9181379961 is an apocalyptic number.

It is an amenable number.

9181379961 is a deficient number, since it is larger than the sum of its proper divisors (5593259919).

9181379961 is a wasteful number, since it uses less digits than its factorization.

9181379961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706025 (or 2706022 counting only the distinct ones).

The product of its digits is 734832, while the sum is 54.

The square root of 9181379961 is about 95819.5176412405. The cubic root of 9181379961 is about 2093.9645269207.

The spelling of 9181379961 in words is "nine billion, one hundred eighty-one million, three hundred seventy-nine thousand, nine hundred sixty-one".