81401459 has 2 divisors, whose sum is σ = 81401460. Its totient is φ = 81401458.

The previous prime is 81401431. The next prime is 81401461. The reversal of 81401459 is 95410418.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81401459 is a prime.

It is a Sophie Germain prime.

Together with 81401461, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81401659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40700729 + 40700730.

It is an arithmetic number, because the mean of its divisors is an integer number (40700730).

Almost surely, 2^81401459 is an apocalyptic number.

81401459 is a deficient number, since it is larger than the sum of its proper divisors (1).

81401459 is an equidigital number, since it uses as much as digits as its factorization.

81401459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 81401459 is about 9022.2757107063. The cubic root of 81401459 is about 433.3885132230.

The spelling of 81401459 in words is "eighty-one million, four hundred one thousand, four hundred fifty-nine".