1226531620 has 12 divisors (see below), whose sum is σ = 2575716444. Its totient is φ = 490612640.

The previous prime is 1226531617. The next prime is 1226531627. The reversal of 1226531620 is 261356221.

It can be written as a sum of positive squares in 2 ways, for example, as 557998884 + 668532736 = 23622^2 + 25856^2 .

It is not an unprimeable number, because it can be changed into a prime (1226531627) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 30663271 + ... + 30663310.

It is an arithmetic number, because the mean of its divisors is an integer number (214643037).

Almost surely, 2^1226531620 is an apocalyptic number.

1226531620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1226531620 is an abundant number, since it is smaller than the sum of its proper divisors (1349184824).

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

1226531620 is a wasteful number, since it uses less digits than its factorization.

1226531620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61326590 (or 61326588 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1226531620 is about 35021.8734507450. The cubic root of 1226531620 is about 1070.4332306861.

Adding to 1226531620 its reverse (261356221), we get a palindrome (1487887841).

The spelling of 1226531620 in words is "one billion, two hundred twenty-six million, five hundred thirty-one thousand, six hundred twenty".