2161434523 has 2 divisors, whose sum is σ = 2161434524. Its totient is φ = 2161434522.

The previous prime is 2161434521. The next prime is 2161434557. The reversal of 2161434523 is 3254341612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2161434523 - 2¹ = 2161434521 is a prime.

Together with 2161434521, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (2161434521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080717261 + 1080717262.

It is an arithmetic number, because the mean of its divisors is an integer number (1080717262).

Almost surely, 2^2161434523 is an apocalyptic number.

2161434523 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161434523 is an equidigital number, since it uses as much as digits as its factorization.

2161434523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 2161434523 is about 46491.2306032009. The cubic root of 2161434523 is about 1292.9469160731.

The spelling of 2161434523 in words is "two billion, one hundred sixty-one million, four hundred thirty-four thousand, five hundred twenty-three".