2169791651 has 4 divisors (see below), whose sum is σ = 2297426472. Its totient is φ = 2042156832.

The previous prime is 2169791623. The next prime is 2169791669. The reversal of 2169791651 is 1561979612.

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-2169791651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2169791596 and 2169791605.

It is not an unprimeable number, because it can be changed into a prime (2169791681) 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, 63817385 + ... + 63817418.

It is an arithmetic number, because the mean of its divisors is an integer number (574356618).

Almost surely, 2^2169791651 is an apocalyptic number.

2169791651 is a deficient number, since it is larger than the sum of its proper divisors (127634821).

2169791651 is a wasteful number, since it uses less digits than its factorization.

2169791651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127634820.

The product of its digits is 204120, while the sum is 47.

The square root of 2169791651 is about 46581.0224340342. The cubic root of 2169791651 is about 1294.6111544040.

The spelling of 2169791651 in words is "two billion, one hundred sixty-nine million, seven hundred ninety-one thousand, six hundred fifty-one".