2117989951 has 8 divisors (see below), whose sum is σ = 2640610944. Its totient is φ = 1650381720.

The previous prime is 2117989919. The next prime is 2117989961. The reversal of 2117989951 is 1599897112.

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 2117989951 - 2⁵ = 2117989919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117989901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13753105 + ... + 13753258.

It is an arithmetic number, because the mean of its divisors is an integer number (330076368).

Almost surely, 2^2117989951 is an apocalyptic number.

2117989951 is a deficient number, since it is larger than the sum of its proper divisors (522620993).

2117989951 is a wasteful number, since it uses less digits than its factorization.

2117989951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27506381.

The product of its digits is 408240, while the sum is 52.

The square root of 2117989951 is about 46021.6248192086. The cubic root of 2117989951 is about 1284.2255273519.

The spelling of 2117989951 in words is "two billion, one hundred seventeen million, nine hundred eighty-nine thousand, nine hundred fifty-one".