1971989459 has 8 divisors (see below), whose sum is σ = 2163698352. Its totient is φ = 1782353440.

The previous prime is 1971989441. The next prime is 1971989471. The reversal of 1971989459 is 9549891791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1971989459 is a prime.

It is a super-2 number, since 2×1971989459² = 7777484852814225362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1971989759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516224 + ... + 520029.

It is an arithmetic number, because the mean of its divisors is an integer number (270462294).

Almost surely, 2^1971989459 is an apocalyptic number.

1971989459 is a deficient number, since it is larger than the sum of its proper divisors (191708893).

1971989459 is a wasteful number, since it uses less digits than its factorization.

1971989459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036437.

The product of its digits is 7348320, while the sum is 62.

The square root of 1971989459 is about 44407.0879364995. The cubic root of 1971989459 is about 1254.0115302483.

The spelling of 1971989459 in words is "one billion, nine hundred seventy-one million, nine hundred eighty-nine thousand, four hundred fifty-nine".