1228260261 has 8 divisors (see below), whose sum is σ = 1638011584. Its totient is φ = 818674560.

The previous prime is 1228260227. The next prime is 1228260317. The reversal of 1228260261 is 1620628221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1228260261 - 2¹⁵ = 1228227493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228260221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22921 + ... + 54606.

It is an arithmetic number, because the mean of its divisors is an integer number (204751448).

Almost surely, 2^1228260261 is an apocalyptic number.

It is an amenable number.

1228260261 is a deficient number, since it is larger than the sum of its proper divisors (409751323).

1228260261 is an equidigital number, since it uses as much as digits as its factorization.

1228260261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82811.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1228260261 is about 35046.5442090943. The cubic root of 1228260261 is about 1070.9358746514.

Adding to 1228260261 its reverse (1620628221), we get a palindrome (2848888482).

The spelling of 1228260261 in words is "one billion, two hundred twenty-eight million, two hundred sixty thousand, two hundred sixty-one".