2261289561 has 8 divisors (see below), whose sum is σ = 3192408864. Its totient is φ = 1418848320.

The previous prime is 2261289539. The next prime is 2261289623. The reversal of 2261289561 is 1659821622.

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

It is not a de Polignac number, because 2261289561 - 2⁶ = 2261289497 is a prime.

It is a super-2 number, since 2×2261289561² = 10226860957375145442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2261269561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22169455 + ... + 22169556.

It is an arithmetic number, because the mean of its divisors is an integer number (399051108).

Almost surely, 2^2261289561 is an apocalyptic number.

It is an amenable number.

2261289561 is a deficient number, since it is larger than the sum of its proper divisors (931119303).

2261289561 is a wasteful number, since it uses less digits than its factorization.

2261289561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44339031.

The product of its digits is 103680, while the sum is 42.

The square root of 2261289561 is about 47553.0184215471. The cubic root of 2261289561 is about 1312.5586728238.

The spelling of 2261289561 in words is "two billion, two hundred sixty-one million, two hundred eighty-nine thousand, five hundred sixty-one".