2138651969 has 8 divisors (see below), whose sum is σ = 2266276320. Its totient is φ = 2011230016.

The previous prime is 2138651917. The next prime is 2138652007. The reversal of 2138651969 is 9691568312.

It is a happy number.

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

It is not a de Polignac number, because 2138651969 - 2²⁴ = 2121874753 is a prime.

It is a super-2 number, since 2×2138651969² = 9147664489015153922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2138651069) 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 in 7 ways as a sum of consecutive naturals, for example, 28559 + ... + 71364.

It is an arithmetic number, because the mean of its divisors is an integer number (283284540).

Almost surely, 2^2138651969 is an apocalyptic number.

It is an amenable number.

2138651969 is a deficient number, since it is larger than the sum of its proper divisors (127624351).

2138651969 is a wasteful number, since it uses less digits than its factorization.

2138651969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101199.

The product of its digits is 699840, while the sum is 50.

The square root of 2138651969 is about 46245.5616140619. The cubic root of 2138651969 is about 1288.3881012933.

The spelling of 2138651969 in words is "two billion, one hundred thirty-eight million, six hundred fifty-one thousand, nine hundred sixty-nine".