81290467 has 2 divisors, whose sum is σ = 81290468. Its totient is φ = 81290466.

The previous prime is 81290459. The next prime is 81290471. The reversal of 81290467 is 76409218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81290467 - 2³ = 81290459 is a prime.

It is not a weakly prime, because it can be changed into another prime (81290437) 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, 40645233 + 40645234.

It is an arithmetic number, because the mean of its divisors is an integer number (40645234).

Almost surely, 2^81290467 is an apocalyptic number.

81290467 is a deficient number, since it is larger than the sum of its proper divisors (1).

81290467 is an equidigital number, since it uses as much as digits as its factorization.

81290467 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 81290467 is about 9016.1226145167. The cubic root of 81290467 is about 433.1914465779.

The spelling of 81290467 in words is "eighty-one million, two hundred ninety thousand, four hundred sixty-seven".