81078953 has 2 divisors, whose sum is σ = 81078954. Its totient is φ = 81078952.

The previous prime is 81078917. The next prime is 81078961. The reversal of 81078953 is 35987018.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80496784 + 582169 = 8972^2 + 763^2 .

It is a cyclic number.

It is not a de Polignac number, because 81078953 - 2⁶ = 81078889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81078953.

It is not a weakly prime, because it can be changed into another prime (81078553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40539476 + 40539477.

It is an arithmetic number, because the mean of its divisors is an integer number (40539477).

Almost surely, 2^81078953 is an apocalyptic number.

It is an amenable number.

81078953 is a deficient number, since it is larger than the sum of its proper divisors (1).

81078953 is an equidigital number, since it uses as much as digits as its factorization.

81078953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 81078953 is about 9004.3852094410. The cubic root of 81078953 is about 432.8154056020.

The spelling of 81078953 in words is "eighty-one million, seventy-eight thousand, nine hundred fifty-three".