81045007 has 2 divisors, whose sum is σ = 81045008. Its totient is φ = 81045006.

The previous prime is 81044993. The next prime is 81045011. The reversal of 81045007 is 70054018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81045007 - 2¹⁹ = 80520719 is a prime.

It is the 9003-rd Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81045017) by changing a digit.

It is a nontrivial repunit in base 9002.

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, 40522503 + 40522504.

It is an arithmetic number, because the mean of its divisors is an integer number (40522504).

Almost surely, 2^81045007 is an apocalyptic number.

81045007 is a deficient number, since it is larger than the sum of its proper divisors (1).

81045007 is an equidigital number, since it uses as much as digits as its factorization.

81045007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 81045007 is about 9002.5000416551. The cubic root of 81045007 is about 432.7549936942.

The spelling of 81045007 in words is "eighty-one million, forty-five thousand, seven".