9611854181381 has 2 divisors, whose sum is σ = 9611854181382. Its totient is φ = 9611854181380.

The previous prime is 9611854181341. The next prime is 9611854181429. The reversal of 9611854181381 is 1831814581169.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9592858450756 + 18995730625 = 3097234^2 + 137825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9611854181381 is a prime.

It is a super-2 number, since 2×9611854181381² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9611854181341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4805927090690 + 4805927090691.

It is an arithmetic number, because the mean of its divisors is an integer number (4805927090691).

Almost surely, 2^{9611854181381} is an apocalyptic number.

It is an amenable number.

9611854181381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9611854181381 is an equidigital number, since it uses as much as digits as its factorization.

9611854181381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 56.

The spelling of 9611854181381 in words is "nine trillion, six hundred eleven billion, eight hundred fifty-four million, one hundred eighty-one thousand, three hundred eighty-one".