2011561617 has 8 divisors (see below), whose sum is σ = 2888396224. Its totient is φ = 1237884048.

The previous prime is 2011561613. The next prime is 2011561621. The reversal of 2011561617 is 7161651102.

It is an interprime number because it is at equal distance from previous prime (2011561613) and next prime (2011561621).

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

It is not a de Polignac number, because 2011561617 - 2² = 2011561613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2011561613) 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, 25789213 + ... + 25789290.

It is an arithmetic number, because the mean of its divisors is an integer number (361049528).

Almost surely, 2^2011561617 is an apocalyptic number.

It is an amenable number.

2011561617 is a deficient number, since it is larger than the sum of its proper divisors (876834607).

2011561617 is a wasteful number, since it uses less digits than its factorization.

2011561617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51578519.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 2011561617 is about 44850.4360848365. The cubic root of 2011561617 is about 1262.3441741083.

The spelling of 2011561617 in words is "two billion, eleven million, five hundred sixty-one thousand, six hundred seventeen".