1005721459 has 2 divisors, whose sum is σ = 1005721460. Its totient is φ = 1005721458.

The previous prime is 1005721447. The next prime is 1005721469. The reversal of 1005721459 is 9541275001.

It is a strong prime.

It is an emirp because it is prime and its reverse (9541275001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1005721459 - 2⁷ = 1005721331 is a prime.

It is a super-2 number, since 2×1005721459² = 2022951306186177362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1005721469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502860729 + 502860730.

It is an arithmetic number, because the mean of its divisors is an integer number (502860730).

Almost surely, 2^1005721459 is an apocalyptic number.

1005721459 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005721459 is an equidigital number, since it uses as much as digits as its factorization.

1005721459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 1005721459 is about 31713.1117836140. Note that the first 3 decimals coincide. The cubic root of 1005721459 is about 1001.9035272848.

The spelling of 1005721459 in words is "one billion, five million, seven hundred twenty-one thousand, four hundred fifty-nine".