2144959681 has 4 divisors (see below), whose sum is σ = 2159164864. Its totient is φ = 2130754500.

The previous prime is 2144959667. The next prime is 2144959697. The reversal of 2144959681 is 1869594412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2144959681 is a prime.

It is a super-2 number, since 2×2144959681² = 9201704066231243522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2144959631) 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, 7102365 + ... + 7102666.

It is an arithmetic number, because the mean of its divisors is an integer number (539791216).

Almost surely, 2^2144959681 is an apocalyptic number.

It is an amenable number.

2144959681 is a deficient number, since it is larger than the sum of its proper divisors (14205183).

2144959681 is a wasteful number, since it uses less digits than its factorization.

2144959681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14205182.

The product of its digits is 622080, while the sum is 49.

The square root of 2144959681 is about 46313.7094282028. The cubic root of 2144959681 is about 1289.6535096903.

The spelling of 2144959681 in words is "two billion, one hundred forty-four million, nine hundred fifty-nine thousand, six hundred eighty-one".