1226081539 has 4 divisors (see below), whose sum is σ = 1279389456. Its totient is φ = 1172773624.

The previous prime is 1226081503. The next prime is 1226081569. The reversal of 1226081539 is 9351806221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9351806221 = 331 ⋅28253191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1226081539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1226081498 and 1226081507.

It is not an unprimeable number, because it can be changed into a prime (1226081569) 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, 26653924 + ... + 26653969.

It is an arithmetic number, because the mean of its divisors is an integer number (319847364).

Almost surely, 2^1226081539 is an apocalyptic number.

1226081539 is a deficient number, since it is larger than the sum of its proper divisors (53307917).

1226081539 is an equidigital number, since it uses as much as digits as its factorization.

1226081539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53307916.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1226081539 is about 35015.4471483658. The cubic root of 1226081539 is about 1070.3022813235.

The spelling of 1226081539 in words is "one billion, two hundred twenty-six million, eighty-one thousand, five hundred thirty-nine".