261722226 has 32 divisors (see below), whose sum is σ = 562728960. Its totient is φ = 80888976.

The previous prime is 261722177. The next prime is 261722231. The reversal of 261722226 is 622227162.

261722226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 261722193 and 261722202.

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, 19066 + ... + 29781.

It is an arithmetic number, because the mean of its divisors is an integer number (17585280).

Almost surely, 2^261722226 is an apocalyptic number.

261722226 is an abundant number, since it is smaller than the sum of its proper divisors (301006734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261722226 is a wasteful number, since it uses less digits than its factorization.

261722226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48918.

The product of its digits is 8064, while the sum is 30.

The square root of 261722226 is about 16177.8313132509. The cubic root of 261722226 is about 639.6565751909.

Adding to 261722226 its reverse (622227162), we get a palindrome (883949388).

The spelling of 261722226 in words is "two hundred sixty-one million, seven hundred twenty-two thousand, two hundred twenty-six".