2161972433 has 4 divisors (see below), whose sum is σ = 2289147300. Its totient is φ = 2034797568.

The previous prime is 2161972429. The next prime is 2161972441. The reversal of 2161972433 is 3342791612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1990676689 + 171295744 = 44617^2 + 13088^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161972433 - 2² = 2161972429 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161974433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63587408 + ... + 63587441.

It is an arithmetic number, because the mean of its divisors is an integer number (572286825).

Almost surely, 2^2161972433 is an apocalyptic number.

It is an amenable number.

2161972433 is a deficient number, since it is larger than the sum of its proper divisors (127174867).

2161972433 is a wasteful number, since it uses less digits than its factorization.

2161972433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127174866.

The product of its digits is 54432, while the sum is 38.

The square root of 2161972433 is about 46497.0153128134. The cubic root of 2161972433 is about 1293.0541645048.

The spelling of 2161972433 in words is "two billion, one hundred sixty-one million, nine hundred seventy-two thousand, four hundred thirty-three".