1291944498 has 48 divisors (see below), whose sum is σ = 2843942976. Its totient is φ = 390985920.

The previous prime is 1291944487. The next prime is 1291944541. The reversal of 1291944498 is 8944491921.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1291944498.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51411 + ... + 72297.

It is an arithmetic number, because the mean of its divisors is an integer number (59248812).

Almost surely, 2^1291944498 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1291944498, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1421971488).

1291944498 is an abundant number, since it is smaller than the sum of its proper divisors (1551998478).

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

1291944498 is a wasteful number, since it uses less digits than its factorization.

1291944498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20979 (or 20966 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The square root of 1291944498 is about 35943.6294494588. The cubic root of 1291944498 is about 1089.1339241545.

The spelling of 1291944498 in words is "one billion, two hundred ninety-one million, nine hundred forty-four thousand, four hundred ninety-eight".