2156736959 has 4 divisors (see below), whose sum is σ = 2322639816. Its totient is φ = 1990834104.

The previous prime is 2156736947. The next prime is 2156736973. The reversal of 2156736959 is 9596376512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2156736959 - 2¹⁶ = 2156671423 is a prime.

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 2156736959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156736559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82951409 + ... + 82951434.

It is an arithmetic number, because the mean of its divisors is an integer number (580659954).

Almost surely, 2^2156736959 is an apocalyptic number.

2156736959 is a deficient number, since it is larger than the sum of its proper divisors (165902857).

2156736959 is a wasteful number, since it uses less digits than its factorization.

2156736959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165902856.

The product of its digits is 3061800, while the sum is 53.

The square root of 2156736959 is about 46440.6821547660. The cubic root of 2156736959 is about 1292.0095592321.

The spelling of 2156736959 in words is "two billion, one hundred fifty-six million, seven hundred thirty-six thousand, nine hundred fifty-nine".