261122315 has 4 divisors (see below), whose sum is σ = 313346784. Its totient is φ = 208897848.

The previous prime is 261122311. The next prime is 261122333. The reversal of 261122315 is 513221162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261122315 - 2² = 261122311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261122311) 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 3 ways as a sum of consecutive naturals, for example, 26112227 + ... + 26112236.

It is an arithmetic number, because the mean of its divisors is an integer number (78336696).

Almost surely, 2^261122315 is an apocalyptic number.

261122315 is a deficient number, since it is larger than the sum of its proper divisors (52224469).

261122315 is an equidigital number, since it uses as much as digits as its factorization.

261122315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52224468.

The product of its digits is 720, while the sum is 23.

The square root of 261122315 is about 16159.2795322069. The cubic root of 261122315 is about 639.1674681047.

Adding to 261122315 its reverse (513221162), we get a palindrome (774343477).

The spelling of 261122315 in words is "two hundred sixty-one million, one hundred twenty-two thousand, three hundred fifteen".