261273226 has 4 divisors (see below), whose sum is σ = 391909842. Its totient is φ = 130636612.

The previous prime is 261273211. The next prime is 261273247. The reversal of 261273226 is 622372162.

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

It can be written as a sum of positive squares in only one way, i.e., 260790201 + 483025 = 16149^2 + 695^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65318305 + ... + 65318308.

Almost surely, 2^261273226 is an apocalyptic number.

261273226 is a deficient number, since it is larger than the sum of its proper divisors (130636616).

261273226 is a wasteful number, since it uses less digits than its factorization.

261273226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130636615.

The product of its digits is 12096, while the sum is 31.

The square root of 261273226 is about 16163.9483419120. The cubic root of 261273226 is about 639.2905762170.

The spelling of 261273226 in words is "two hundred sixty-one million, two hundred seventy-three thousand, two hundred twenty-six".