81148159 has 2 divisors, whose sum is σ = 81148160. Its totient is φ = 81148158.

The previous prime is 81148127. The next prime is 81148213. The reversal of 81148159 is 95184118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81148159 - 2⁵ = 81148127 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81148559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40574079 + 40574080.

It is an arithmetic number, because the mean of its divisors is an integer number (40574080).

Almost surely, 2^81148159 is an apocalyptic number.

81148159 is a deficient number, since it is larger than the sum of its proper divisors (1).

81148159 is an equidigital number, since it uses as much as digits as its factorization.

81148159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 37.

The square root of 81148159 is about 9008.2272950898. The cubic root of 81148159 is about 432.9385156633.

It can be divided in two parts, 81 and 148159, that added together give a triangular number (148240 = T₅₄₄).

The spelling of 81148159 in words is "eighty-one million, one hundred forty-eight thousand, one hundred fifty-nine".