261122619 has 4 divisors (see below), whose sum is σ = 348163496. Its totient is φ = 174081744.

The previous prime is 261122591. The next prime is 261122623. The reversal of 261122619 is 916221162.

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

It is not a de Polignac number, because 261122619 - 2⁹ = 261122107 is a prime.

It is a super-2 number, since 2×261122619² = 136370044306838322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261122629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43520434 + ... + 43520439.

It is an arithmetic number, because the mean of its divisors is an integer number (87040874).

Almost surely, 2^261122619 is an apocalyptic number.

261122619 is a deficient number, since it is larger than the sum of its proper divisors (87040877).

261122619 is an equidigital number, since it uses as much as digits as its factorization.

261122619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87040876.

The product of its digits is 2592, while the sum is 30.

The square root of 261122619 is about 16159.2889385641. The cubic root of 261122619 is about 639.1677161453.

The spelling of 261122619 in words is "two hundred sixty-one million, one hundred twenty-two thousand, six hundred nineteen".