2261591465 has 16 divisors (see below), whose sum is σ = 3144102528. Its totient is φ = 1529559936.

The previous prime is 2261591443. The next prime is 2261591491. The reversal of 2261591465 is 5641951622.

It is a cyclic number.

It is not a de Polignac number, because 2261591465 - 2¹⁴ = 2261575081 is a prime.

It is a super-2 number, since 2×2261591465² = 10229591909121692450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440027 + ... + 445136.

It is an arithmetic number, because the mean of its divisors is an integer number (196506408).

Almost surely, 2^2261591465 is an apocalyptic number.

It is an amenable number.

2261591465 is a deficient number, since it is larger than the sum of its proper divisors (882511063).

2261591465 is an equidigital number, since it uses as much as digits as its factorization.

2261591465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885248.

The product of its digits is 129600, while the sum is 41.

The square root of 2261591465 is about 47556.1927092571. The cubic root of 2261591465 is about 1312.6170833117.

The spelling of 2261591465 in words is "two billion, two hundred sixty-one million, five hundred ninety-one thousand, four hundred sixty-five".