1291326696 has 48 divisors (see below), whose sum is σ = 3815285760. Its totient is φ = 391310880.

The previous prime is 1291326691. The next prime is 1291326709. The reversal of 1291326696 is 6966231921.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1291326691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 814440 + ... + 816023.

It is an arithmetic number, because the mean of its divisors is an integer number (79485120).

Almost surely, 2^1291326696 is an apocalyptic number.

It is an amenable number.

1291326696 is an abundant number, since it is smaller than the sum of its proper divisors (2523959064).

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

1291326696 is a wasteful number, since it uses less digits than its factorization.

1291326696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630486 (or 1630479 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 1291326696 is about 35935.0343815057. The cubic root of 1291326696 is about 1088.9602901735.

The spelling of 1291326696 in words is "one billion, two hundred ninety-one million, three hundred twenty-six thousand, six hundred ninety-six".