81153930941 has 2 divisors, whose sum is σ = 81153930942. Its totient is φ = 81153930940.

The previous prime is 81153930889. The next prime is 81153930953. The reversal of 81153930941 is 14903935118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81137243716 + 16687225 = 284846^2 + 4085^2 .

It is a cyclic number.

It is not a de Polignac number, because 81153930941 - 2⁶ = 81153930877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81153930892 and 81153930901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81153930961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40576965470 + 40576965471.

It is an arithmetic number, because the mean of its divisors is an integer number (40576965471).

Almost surely, 2^81153930941 is an apocalyptic number.

It is an amenable number.

81153930941 is a deficient number, since it is larger than the sum of its proper divisors (1).

81153930941 is an equidigital number, since it uses as much as digits as its factorization.

81153930941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 44.

The spelling of 81153930941 in words is "eighty-one billion, one hundred fifty-three million, nine hundred thirty thousand, nine hundred forty-one".