81147041 has 2 divisors, whose sum is σ = 81147042. Its totient is φ = 81147040.

The previous prime is 81146993. The next prime is 81147047. The reversal of 81147041 is 14074118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78836641 + 2310400 = 8879^2 + 1520^2 .

It is a cyclic number.

It is not a de Polignac number, because 81147041 - 2¹⁴ = 81130657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81147041.

It is not a weakly prime, because it can be changed into another prime (81147047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40573520 + 40573521.

It is an arithmetic number, because the mean of its divisors is an integer number (40573521).

Almost surely, 2^81147041 is an apocalyptic number.

It is an amenable number.

81147041 is a deficient number, since it is larger than the sum of its proper divisors (1).

81147041 is an equidigital number, since it uses as much as digits as its factorization.

81147041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 81147041 is about 9008.1652404915. The cubic root of 81147041 is about 432.9365274174.

The spelling of 81147041 in words is "eighty-one million, one hundred forty-seven thousand, forty-one".