7121636889 has 32 divisors (see below), whose sum is σ = 10211725440. Its totient is φ = 4398907392.

The previous prime is 7121636869. The next prime is 7121636891. The reversal of 7121636889 is 9886361217.

It is not a de Polignac number, because 7121636889 - 2²³ = 7113248281 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (7121636839) 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 31 ways as a sum of consecutive naturals, for example, 951042 + ... + 958500.

It is an arithmetic number, because the mean of its divisors is an integer number (319116420).

Almost surely, 2^7121636889 is an apocalyptic number.

It is an amenable number.

7121636889 is a deficient number, since it is larger than the sum of its proper divisors (3090088551).

7121636889 is a wasteful number, since it uses less digits than its factorization.

7121636889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7769.

The product of its digits is 870912, while the sum is 51.

The square root of 7121636889 is about 84389.7913790525. The cubic root of 7121636889 is about 1923.9477592420.

The spelling of 7121636889 in words is "seven billion, one hundred twenty-one million, six hundred thirty-six thousand, eight hundred eighty-nine".