1291079692 has 48 divisors (see below), whose sum is σ = 2689247232. Its totient is φ = 530691840.

The previous prime is 1291079663. The next prime is 1291079693. The reversal of 1291079692 is 2969701921.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1291079693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91503 + ... + 104665.

It is an arithmetic number, because the mean of its divisors is an integer number (56025984).

Almost surely, 2^1291079692 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291079692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1344623616).

1291079692 is an abundant number, since it is smaller than the sum of its proper divisors (1398167540).

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

1291079692 is a wasteful number, since it uses less digits than its factorization.

1291079692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13318 (or 13316 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 1291079692 is about 35931.5974039563. The cubic root of 1291079692 is about 1088.8908539107.

The spelling of 1291079692 in words is "one billion, two hundred ninety-one million, seventy-nine thousand, six hundred ninety-two".