2136191669 has 4 divisors (see below), whose sum is σ = 2136297996. Its totient is φ = 2136085344.

The previous prime is 2136191647. The next prime is 2136191671. The reversal of 2136191669 is 9661916312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1954966225 + 181225444 = 44215^2 + 13462^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2136191669 is a prime.

It is a super-2 number, since 2×2136191669² = 9126629693410011122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2136191639) 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, 12824 + ... + 66609.

It is an arithmetic number, because the mean of its divisors is an integer number (534074499).

Almost surely, 2^2136191669 is an apocalyptic number.

It is an amenable number.

2136191669 is a deficient number, since it is larger than the sum of its proper divisors (106327).

2136191669 is an equidigital number, since it uses as much as digits as its factorization.

2136191669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106326.

The product of its digits is 104976, while the sum is 44.

The square root of 2136191669 is about 46218.9535688553. The cubic root of 2136191669 is about 1287.8938588784.

The spelling of 2136191669 in words is "two billion, one hundred thirty-six million, one hundred ninety-one thousand, six hundred sixty-nine".