2159552261 has 4 divisors (see below), whose sum is σ = 2160204300. Its totient is φ = 2158900224.

The previous prime is 2159552243. The next prime is 2159552267. The reversal of 2159552261 is 1622559512.

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 560032225 + 1599520036 = 23665^2 + 39994^2 .

It is a cyclic number.

It is not a de Polignac number, because 2159552261 - 2¹⁰ = 2159551237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159552267) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 321026 + ... + 327683.

It is an arithmetic number, because the mean of its divisors is an integer number (540051075).

Almost surely, 2^2159552261 is an apocalyptic number.

It is an amenable number.

2159552261 is a deficient number, since it is larger than the sum of its proper divisors (652039).

2159552261 is an equidigital number, since it uses as much as digits as its factorization.

2159552261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652038.

The product of its digits is 54000, while the sum is 38.

The square root of 2159552261 is about 46470.9830001475. The cubic root of 2159552261 is about 1292.5714907698.

The spelling of 2159552261 in words is "two billion, one hundred fifty-nine million, five hundred fifty-two thousand, two hundred sixty-one".