2171561313 has 8 divisors (see below), whose sum is σ = 2914848000. Its totient is φ = 1437991088.

The previous prime is 2171561311. The next prime is 2171561323. The reversal of 2171561313 is 3131651712.

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

It is a cyclic number.

It is not a de Polignac number, because 2171561313 - 2¹ = 2171561311 is a prime.

It is a super-2 number, since 2×2171561313² = 9431357072236567938, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2171561311) 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, 2428593 + ... + 2429486.

It is an arithmetic number, because the mean of its divisors is an integer number (364356000).

Almost surely, 2^2171561313 is an apocalyptic number.

It is an amenable number.

2171561313 is a deficient number, since it is larger than the sum of its proper divisors (743286687).

2171561313 is a wasteful number, since it uses less digits than its factorization.

2171561313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4858231.

The product of its digits is 3780, while the sum is 30.

The square root of 2171561313 is about 46600.0140879807. The cubic root of 2171561313 is about 1294.9630163904.

It can be divided in two parts, 21715 and 61313, that added together give a triangular number (83028 = T₄₀₇).

The spelling of 2171561313 in words is "two billion, one hundred seventy-one million, five hundred sixty-one thousand, three hundred thirteen".