1265501226 has 64 divisors (see below), whose sum is σ = 2862397440. Its totient is φ = 369663360.

The previous prime is 1265501219. The next prime is 1265501257. The reversal of 1265501226 is 6221055621.

It is a junction number, because it is equal to n+sod(n) for n = 1265501193 and 1265501202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204790 + ... + 210878.

It is an arithmetic number, because the mean of its divisors is an integer number (44724960).

Almost surely, 2^1265501226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265501226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1431198720).

1265501226 is an abundant number, since it is smaller than the sum of its proper divisors (1596896214).

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

1265501226 is a wasteful number, since it uses less digits than its factorization.

1265501226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6219.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1265501226 is about 35573.8840443379. The cubic root of 1265501226 is about 1081.6519147542.

Adding to 1265501226 its reverse (6221055621), we get a palindrome (7486556847).

The spelling of 1265501226 in words is "one billion, two hundred sixty-five million, five hundred one thousand, two hundred twenty-six".