1213806522 has 16 divisors (see below), whose sum is σ = 2432484000. Its totient is φ = 403790352.

The previous prime is 1213806509. The next prime is 1213806541. The reversal of 1213806522 is 2256083121.

It is a self number, because there is not a number n which added to its sum of digits gives 1213806522.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199713 + ... + 205700.

It is an arithmetic number, because the mean of its divisors is an integer number (152030250).

Almost surely, 2^1213806522 is an apocalyptic number.

1213806522 is an abundant number, since it is smaller than the sum of its proper divisors (1218677478).

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

1213806522 is a wasteful number, since it uses less digits than its factorization.

1213806522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405917.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1213806522 is about 34839.7262044351. The cubic root of 1213806522 is about 1066.7184880856.

Adding to 1213806522 its reverse (2256083121), we get a palindrome (3469889643).

The spelling of 1213806522 in words is "one billion, two hundred thirteen million, eight hundred six thousand, five hundred twenty-two".