81150281111 has 2 divisors, whose sum is σ = 81150281112. Its totient is φ = 81150281110.

The previous prime is 81150281101. The next prime is 81150281119. The reversal of 81150281111 is 11118205118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81150281111 - 2¹⁸ = 81150018967 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81150281119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40575140555 + 40575140556.

It is an arithmetic number, because the mean of its divisors is an integer number (40575140556).

Almost surely, 2^81150281111 is an apocalyptic number.

81150281111 is a deficient number, since it is larger than the sum of its proper divisors (1).

81150281111 is an equidigital number, since it uses as much as digits as its factorization.

81150281111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 29.

Adding to 81150281111 its reverse (11118205118), we get a palindrome (92268486229).

The spelling of 81150281111 in words is "eighty-one billion, one hundred fifty million, two hundred eighty-one thousand, one hundred eleven".