1291651347 has 16 divisors (see below), whose sum is σ = 2084009472. Its totient is φ = 694669440.

The previous prime is 1291651297. The next prime is 1291651373. The reversal of 1291651347 is 7431561921.

It is not a de Polignac number, because 1291651347 - 2⁷ = 1291651219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1291651247) 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, 1808679 + ... + 1809392.

It is an arithmetic number, because the mean of its divisors is an integer number (130250592).

Almost surely, 2^1291651347 is an apocalyptic number.

1291651347 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1291651347 is a deficient number, since it is larger than the sum of its proper divisors (792358125).

1291651347 is a wasteful number, since it uses less digits than its factorization.

1291651347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3618098.

The product of its digits is 45360, while the sum is 39.

The square root of 1291651347 is about 35939.5512910220. The cubic root of 1291651347 is about 1089.0515406229.

The spelling of 1291651347 in words is "one billion, two hundred ninety-one million, six hundred fifty-one thousand, three hundred forty-seven".