1226321645 has 8 divisors (see below), whose sum is σ = 1471883640. Its totient is φ = 980858880.

The previous prime is 1226321641. The next prime is 1226321669. The reversal of 1226321645 is 5461236221.

It can be written as a sum of positive squares in 4 ways, for example, as 37589161 + 1188732484 = 6131^2 + 34478^2 .

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

It is not a de Polignac number, because 1226321645 - 2² = 1226321641 is a prime.

It is a super-3 number, since 3×1226321645³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226321641) 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, 5825 + ... + 49865.

It is an arithmetic number, because the mean of its divisors is an integer number (183985455).

Almost surely, 2^1226321645 is an apocalyptic number.

It is an amenable number.

1226321645 is a deficient number, since it is larger than the sum of its proper divisors (245561995).

1226321645 is an equidigital number, since it uses as much as digits as its factorization.

1226321645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49615.

The product of its digits is 17280, while the sum is 32.

The square root of 1226321645 is about 35018.8755530500. The cubic root of 1226321645 is about 1070.3721432421.

Adding to 1226321645 its reverse (5461236221), we get a palindrome (6687557866).

The spelling of 1226321645 in words is "one billion, two hundred twenty-six million, three hundred twenty-one thousand, six hundred forty-five".