1291734851 has 8 divisors (see below), whose sum is σ = 1492057584. Its totient is φ = 1105227520.

The previous prime is 1291734839. The next prime is 1291734869. The reversal of 1291734851 is 1584371921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291734851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1291734799 and 1291734808.

It is not an unprimeable number, because it can be changed into a prime (1291734811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3453650 + ... + 3454023.

It is an arithmetic number, because the mean of its divisors is an integer number (186507198).

Almost surely, 2^1291734851 is an apocalyptic number.

1291734851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1291734851 is a deficient number, since it is larger than the sum of its proper divisors (200322733).

1291734851 is a wasteful number, since it uses less digits than its factorization.

1291734851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6907701.

The product of its digits is 60480, while the sum is 41.

The square root of 1291734851 is about 35940.7130007183. The cubic root of 1291734851 is about 1089.0750088239.

The spelling of 1291734851 in words is "one billion, two hundred ninety-one million, seven hundred thirty-four thousand, eight hundred fifty-one".