81290459 has 2 divisors, whose sum is σ = 81290460. Its totient is φ = 81290458.

The previous prime is 81290453. The next prime is 81290467. The reversal of 81290459 is 95409218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81290459 - 2¹² = 81286363 is a prime.

It is not a weakly prime, because it can be changed into another prime (81290453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40645229 + 40645230.

It is an arithmetic number, because the mean of its divisors is an integer number (40645230).

Almost surely, 2^81290459 is an apocalyptic number.

81290459 is a deficient number, since it is larger than the sum of its proper divisors (1).

81290459 is an equidigital number, since it uses as much as digits as its factorization.

81290459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 81290459 is about 9016.1221708670. The cubic root of 81290459 is about 433.1914323674.

The spelling of 81290459 in words is "eighty-one million, two hundred ninety thousand, four hundred fifty-nine".