2309961643 has 4 divisors (see below), whose sum is σ = 2519958168. Its totient is φ = 2099965120.

The previous prime is 2309961637. The next prime is 2309961653. The reversal of 2309961643 is 3461699032.

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

It is not a de Polignac number, because 2309961643 - 2²⁹ = 1773090731 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 2309961643.

It is not an unprimeable number, because it can be changed into a prime (2309961653) 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 3 ways as a sum of consecutive naturals, for example, 104998246 + ... + 104998267.

It is an arithmetic number, because the mean of its divisors is an integer number (629989542).

Almost surely, 2^2309961643 is an apocalyptic number.

2309961643 is a deficient number, since it is larger than the sum of its proper divisors (209996525).

2309961643 is a wasteful number, since it uses less digits than its factorization.

2309961643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209996524.

The product of its (nonzero) digits is 209952, while the sum is 43.

The square root of 2309961643 is about 48062.0603282880. The cubic root of 2309961643 is about 1321.9090915414.

The spelling of 2309961643 in words is "two billion, three hundred nine million, nine hundred sixty-one thousand, six hundred forty-three".