1291381716 has 96 divisors (see below), whose sum is σ = 3193344000. Its totient is φ = 405595008.

The previous prime is 1291381711. The next prime is 1291381739. The reversal of 1291381716 is 6171831921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291381711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2941425 + ... + 2941863.

It is an arithmetic number, because the mean of its divisors is an integer number (33264000).

Almost surely, 2^1291381716 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 1291381716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1596672000).

1291381716 is an abundant number, since it is smaller than the sum of its proper divisors (1901962284).

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

1291381716 is a wasteful number, since it uses less digits than its factorization.

1291381716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 659 counting only the distinct ones).

The product of its digits is 18144, while the sum is 39.

The square root of 1291381716 is about 35935.7999215267. The cubic root of 1291381716 is about 1088.9757558555.

The spelling of 1291381716 in words is "one billion, two hundred ninety-one million, three hundred eighty-one thousand, seven hundred sixteen".