2161255441 has 16 divisors (see below), whose sum is σ = 2321298000. Its totient is φ = 2005014528.

The previous prime is 2161255429. The next prime is 2161255451. The reversal of 2161255441 is 1445521612.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 7924225 + 2153331216 = 2815^2 + 46404^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161255441 - 2⁵ = 2161255409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2161255451) 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, 525991 + ... + 530083.

It is an arithmetic number, because the mean of its divisors is an integer number (145081125).

Almost surely, 2^2161255441 is an apocalyptic number.

It is an amenable number.

2161255441 is a deficient number, since it is larger than the sum of its proper divisors (160042559).

2161255441 is a wasteful number, since it uses less digits than its factorization.

2161255441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4548.

The product of its digits is 9600, while the sum is 31.

The square root of 2161255441 is about 46489.3045871844. The cubic root of 2161255441 is about 1292.9112067772.

The spelling of 2161255441 in words is "two billion, one hundred sixty-one million, two hundred fifty-five thousand, four hundred forty-one".