1226061643 has 4 divisors (see below), whose sum is σ = 1232414488. Its totient is φ = 1219708800.

The previous prime is 1226061587. The next prime is 1226061677. The reversal of 1226061643 is 3461606221.

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

It is a cyclic number.

It is not a de Polignac number, because 1226061643 - 2²¹ = 1223964491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226061443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3176133 + ... + 3176518.

It is an arithmetic number, because the mean of its divisors is an integer number (308103622).

Almost surely, 2^1226061643 is an apocalyptic number.

1226061643 is a deficient number, since it is larger than the sum of its proper divisors (6352845).

1226061643 is an equidigital number, since it uses as much as digits as its factorization.

1226061643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6352844.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 1226061643 is about 35015.1630440299. The cubic root of 1226061643 is about 1070.2964919181.

Adding to 1226061643 its reverse (3461606221), we get a palindrome (4687667864).

The spelling of 1226061643 in words is "one billion, two hundred twenty-six million, sixty-one thousand, six hundred forty-three".