1291213326 has 16 divisors (see below), whose sum is σ = 2781075024. Its totient is φ = 397296384.

The previous prime is 1291213303. The next prime is 1291213337. The reversal of 1291213326 is 6233121921.

1291213326 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1291213293 and 1291213302.

It is a congruent number.

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, 8276931 + ... + 8277086.

It is an arithmetic number, because the mean of its divisors is an integer number (173817189).

Almost surely, 2^1291213326 is an apocalyptic number.

1291213326 is an abundant number, since it is smaller than the sum of its proper divisors (1489861698).

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

1291213326 is a wasteful number, since it uses less digits than its factorization.

1291213326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16554035.

The product of its digits is 3888, while the sum is 30.

The square root of 1291213326 is about 35933.4569169180. The cubic root of 1291213326 is about 1088.9284213878.

The spelling of 1291213326 in words is "one billion, two hundred ninety-one million, two hundred thirteen thousand, three hundred twenty-six".