2161653249 has 8 divisors (see below), whose sum is σ = 3293947840. Its totient is φ = 1235230416.

The previous prime is 2161653211. The next prime is 2161653251. The reversal of 2161653249 is 9423561612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2161653249 - 2²⁴ = 2144876033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161653259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51467914 + ... + 51467955.

It is an arithmetic number, because the mean of its divisors is an integer number (411743480).

Almost surely, 2^2161653249 is an apocalyptic number.

It is an amenable number.

2161653249 is a deficient number, since it is larger than the sum of its proper divisors (1132294591).

2161653249 is a wasteful number, since it uses less digits than its factorization.

2161653249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102935879.

The product of its digits is 77760, while the sum is 39.

The square root of 2161653249 is about 46493.5828797911. The cubic root of 2161653249 is about 1292.9905277833.

The spelling of 2161653249 in words is "two billion, one hundred sixty-one million, six hundred fifty-three thousand, two hundred forty-nine".