261421226 has 24 divisors (see below), whose sum is σ = 432284580. Its totient is φ = 118479680.

The previous prime is 261421217. The next prime is 261421241. The reversal of 261421226 is 622124162.

It can be written as a sum of positive squares in 2 ways, for example, as 234120601 + 27300625 = 15301^2 + 5225^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261421195 and 261421204.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92750 + ... + 95526.

Almost surely, 2^261421226 is an apocalyptic number.

261421226 is a deficient number, since it is larger than the sum of its proper divisors (170863354).

261421226 is a wasteful number, since it uses less digits than its factorization.

261421226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3190 (or 3179 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 261421226 is about 16168.5257831381. The cubic root of 261421226 is about 639.4112636001.

Adding to 261421226 its reverse (622124162), we get a palindrome (883545388).

The spelling of 261421226 in words is "two hundred sixty-one million, four hundred twenty-one thousand, two hundred twenty-six".