9144938861 has 2 divisors, whose sum is σ = 9144938862. Its totient is φ = 9144938860.

The previous prime is 9144938857. The next prime is 9144938903. The reversal of 9144938861 is 1688394419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7156314025 + 1988624836 = 84595^2 + 44594^2 .

It is a cyclic number.

It is not a de Polignac number, because 9144938861 - 2² = 9144938857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9144938821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4572469430 + 4572469431.

It is an arithmetic number, because the mean of its divisors is an integer number (4572469431).

Almost surely, 2^9144938861 is an apocalyptic number.

It is an amenable number.

9144938861 is a deficient number, since it is larger than the sum of its proper divisors (1).

9144938861 is an equidigital number, since it uses as much as digits as its factorization.

9144938861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 53.

The square root of 9144938861 is about 95629.1736919231. The cubic root of 9144938861 is about 2091.1905231532.

The spelling of 9144938861 in words is "nine billion, one hundred forty-four million, nine hundred thirty-eight thousand, eight hundred sixty-one".