20191459 has 2 divisors, whose sum is σ = 20191460. Its totient is φ = 20191458.

The previous prime is 20191441. The next prime is 20191481. The reversal of 20191459 is 95419102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20191459 - 2¹⁷ = 20060387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20191459.

It is not a weakly prime, because it can be changed into another prime (20191429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10095729 + 10095730.

It is an arithmetic number, because the mean of its divisors is an integer number (10095730).

Almost surely, 2^20191459 is an apocalyptic number.

20191459 is a deficient number, since it is larger than the sum of its proper divisors (1).

20191459 is an equidigital number, since it uses as much as digits as its factorization.

20191459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 20191459 is about 4493.4907366100. The cubic root of 20191459 is about 272.3051784814.

The spelling of 20191459 in words is "twenty million, one hundred ninety-one thousand, four hundred fifty-nine".