2151791659 has 4 divisors (see below), whose sum is σ = 2151947200. Its totient is φ = 2151636120.

The previous prime is 2151791639. The next prime is 2151791699. The reversal of 2151791659 is 9561971512.

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 2151791659 - 2¹³ = 2151783467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151791639) 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, 54747 + ... + 85444.

It is an arithmetic number, because the mean of its divisors is an integer number (537986800).

Almost surely, 2^2151791659 is an apocalyptic number.

2151791659 is a deficient number, since it is larger than the sum of its proper divisors (155541).

2151791659 is a wasteful number, since it uses less digits than its factorization.

2151791659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155540.

The product of its digits is 170100, while the sum is 46.

The square root of 2151791659 is about 46387.4084100416. The cubic root of 2151791659 is about 1291.0212970655.

The spelling of 2151791659 in words is "two billion, one hundred fifty-one million, seven hundred ninety-one thousand, six hundred fifty-nine".