2161208439 has 16 divisors (see below), whose sum is σ = 3448082400. Its totient is φ = 1329974208.

The previous prime is 2161208437. The next prime is 2161208479. The reversal of 2161208439 is 9348021612.

2161208439 is a `hidden beast` number, since 2 + 1 + 612 + 0 + 8 + 4 + 39 = 666.

It is not a de Polignac number, because 2161208439 - 2¹ = 2161208437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161208437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3078294 + ... + 3078995.

It is an arithmetic number, because the mean of its divisors is an integer number (215505150).

Almost surely, 2^2161208439 is an apocalyptic number.

2161208439 is a deficient number, since it is larger than the sum of its proper divisors (1286873961).

2161208439 is a wasteful number, since it uses less digits than its factorization.

2161208439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6157311 (or 6157305 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 2161208439 is about 46488.7990703137. The cubic root of 2161208439 is about 1292.9018341610.

The spelling of 2161208439 in words is "two billion, one hundred sixty-one million, two hundred eight thousand, four hundred thirty-nine".