81628153 has 2 divisors, whose sum is σ = 81628154. Its totient is φ = 81628152.

The previous prime is 81628139. The next prime is 81628163. The reversal of 81628153 is 35182618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48818169 + 32809984 = 6987^2 + 5728^2 .

It is a cyclic number.

It is not a de Polignac number, because 81628153 - 2⁵ = 81628121 is a prime.

It is not a weakly prime, because it can be changed into another prime (81628103) 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, 40814076 + 40814077.

It is an arithmetic number, because the mean of its divisors is an integer number (40814077).

Almost surely, 2^81628153 is an apocalyptic number.

It is an amenable number.

81628153 is a deficient number, since it is larger than the sum of its proper divisors (1).

81628153 is an equidigital number, since it uses as much as digits as its factorization.

81628153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 81628153 is about 9034.8299928665. The cubic root of 81628153 is about 433.7904532527.

The spelling of 81628153 in words is "eighty-one million, six hundred twenty-eight thousand, one hundred fifty-three".