81003667 has 2 divisors, whose sum is σ = 81003668. Its totient is φ = 81003666.

The previous prime is 81003661. The next prime is 81003697. The reversal of 81003667 is 76630018.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81003667 is a prime.

It is not a weakly prime, because it can be changed into another prime (81003661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40501833 + 40501834.

It is an arithmetic number, because the mean of its divisors is an integer number (40501834).

Almost surely, 2^81003667 is an apocalyptic number.

81003667 is a deficient number, since it is larger than the sum of its proper divisors (1).

81003667 is an equidigital number, since it uses as much as digits as its factorization.

81003667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 81003667 is about 9000.2037199166. The cubic root of 81003667 is about 432.6814002890.

The spelling of 81003667 in words is "eighty-one million, three thousand, six hundred sixty-seven".