1291407851 has 8 divisors (see below), whose sum is σ = 1312027920. Its totient is φ = 1270937088.

The previous prime is 1291407847. The next prime is 1291407857. The reversal of 1291407851 is 1587041921.

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

It is a cyclic number.

It is not a de Polignac number, because 1291407851 - 2² = 1291407847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291407857) 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, 19826 + ... + 54551.

It is an arithmetic number, because the mean of its divisors is an integer number (164003490).

Almost surely, 2^1291407851 is an apocalyptic number.

1291407851 is a deficient number, since it is larger than the sum of its proper divisors (20620069).

1291407851 is an equidigital number, since it uses as much as digits as its factorization.

1291407851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74653.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1291407851 is about 35936.1635542805. The cubic root of 1291407851 is about 1088.9831020411.

The spelling of 1291407851 in words is "one billion, two hundred ninety-one million, four hundred seven thousand, eight hundred fifty-one".