2161378762 has 4 divisors (see below), whose sum is σ = 3242068146. Its totient is φ = 1080689380.

The previous prime is 2161378757. The next prime is 2161378783. The reversal of 2161378762 is 2678731612.

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

It can be written as a sum of positive squares in only one way, i.e., 1209717961 + 951660801 = 34781^2 + 30849^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540344689 + ... + 540344692.

Almost surely, 2^2161378762 is an apocalyptic number.

2161378762 is a deficient number, since it is larger than the sum of its proper divisors (1080689384).

2161378762 is a wasteful number, since it uses less digits than its factorization.

2161378762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080689383.

The product of its digits is 169344, while the sum is 43.

The square root of 2161378762 is about 46490.6309055922. The cubic root of 2161378762 is about 1292.9357974337.

The spelling of 2161378762 in words is "two billion, one hundred sixty-one million, three hundred seventy-eight thousand, seven hundred sixty-two".