2144157791 has 4 divisors (see below), whose sum is σ = 2145238872. Its totient is φ = 2143076712.

The previous prime is 2144157781. The next prime is 2144157797. The reversal of 2144157791 is 1977514412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2144157791 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 (2144157797) 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, 537560 + ... + 541533.

It is an arithmetic number, because the mean of its divisors is an integer number (536309718).

Almost surely, 2^2144157791 is an apocalyptic number.

2144157791 is a deficient number, since it is larger than the sum of its proper divisors (1081081).

2144157791 is a wasteful number, since it uses less digits than its factorization.

2144157791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081080.

The product of its digits is 70560, while the sum is 41.

The square root of 2144157791 is about 46305.0514630963. The cubic root of 2144157791 is about 1289.4927779740.

The spelling of 2144157791 in words is "two billion, one hundred forty-four million, one hundred fifty-seven thousand, seven hundred ninety-one".