81148927 has 2 divisors, whose sum is σ = 81148928. Its totient is φ = 81148926.

The previous prime is 81148897. The next prime is 81148957. The reversal of 81148927 is 72984118.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (81148897) and next prime (81148957).

It is a cyclic number.

It is not a de Polignac number, because 81148927 - 2¹⁹ = 80624639 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81148927.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81148957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40574463 + 40574464.

It is an arithmetic number, because the mean of its divisors is an integer number (40574464).

Almost surely, 2^81148927 is an apocalyptic number.

81148927 is a deficient number, since it is larger than the sum of its proper divisors (1).

81148927 is an equidigital number, since it uses as much as digits as its factorization.

81148927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 40.

The square root of 81148927 is about 9008.2699226877. The cubic root of 81148927 is about 432.9398814603.

The spelling of 81148927 in words is "eighty-one million, one hundred forty-eight thousand, nine hundred twenty-seven".