2261515161 has 8 divisors (see below), whose sum is σ = 3016076320. Its totient is φ = 1507315392.

The previous prime is 2261515129. The next prime is 2261515189. The reversal of 2261515161 is 1615151622.

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

It is not a de Polignac number, because 2261515161 - 2⁵ = 2261515129 is a prime.

It is a super-2 number, since 2×2261515161² = 10228901646865711842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2261515561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75391 + ... + 101028.

It is an arithmetic number, because the mean of its divisors is an integer number (377009540).

Almost surely, 2^2261515161 is an apocalyptic number.

It is an amenable number.

2261515161 is a deficient number, since it is larger than the sum of its proper divisors (754561159).

2261515161 is a wasteful number, since it uses less digits than its factorization.

2261515161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180695.

The product of its digits is 3600, while the sum is 30.

The square root of 2261515161 is about 47555.3904515566. The cubic root of 2261515161 is about 1312.6023209844.

Adding to 2261515161 its reverse (1615151622), we get a palindrome (3876666783).

The spelling of 2261515161 in words is "two billion, two hundred sixty-one million, five hundred fifteen thousand, one hundred sixty-one".