1969289681 has 8 divisors (see below), whose sum is σ = 1976394024. Its totient is φ = 1962195840.

The previous prime is 1969289633. The next prime is 1969289687. The reversal of 1969289681 is 1869829691.

It can be written as a sum of positive squares in 4 ways, for example, as 924707281 + 1044582400 = 30409^2 + 32320^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1969289681 - 2¹⁸ = 1969027537 is a prime.

It is a super-4 number, since 4×1969289681⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1969289681.

It is not an unprimeable number, because it can be changed into a prime (1969289687) 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, 603005 + ... + 606261.

It is an arithmetic number, because the mean of its divisors is an integer number (247049253).

Almost surely, 2^1969289681 is an apocalyptic number.

It is an amenable number.

1969289681 is a deficient number, since it is larger than the sum of its proper divisors (7104343).

1969289681 is a wasteful number, since it uses less digits than its factorization.

1969289681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5251.

The product of its digits is 3359232, while the sum is 59.

The square root of 1969289681 is about 44376.6794724436. The cubic root of 1969289681 is about 1253.4389952526.

The spelling of 1969289681 in words is "one billion, nine hundred sixty-nine million, two hundred eighty-nine thousand, six hundred eighty-one".