1291781151 has 6 divisors (see below), whose sum is σ = 1865906120. Its totient is φ = 861187428.

The previous prime is 1291781149. The next prime is 1291781173. The reversal of 1291781151 is 1511871921.

It is not a de Polignac number, because 1291781151 - 2¹ = 1291781149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291781651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71765611 + ... + 71765628.

Almost surely, 2^1291781151 is an apocalyptic number.

1291781151 is a deficient number, since it is larger than the sum of its proper divisors (574124969).

1291781151 is a wasteful number, since it uses less digits than its factorization.

1291781151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143531245 (or 143531242 counting only the distinct ones).

The product of its digits is 5040, while the sum is 36.

The square root of 1291781151 is about 35941.3571112722. The cubic root of 1291781151 is about 1089.0880206714.

The spelling of 1291781151 in words is "one billion, two hundred ninety-one million, seven hundred eighty-one thousand, one hundred fifty-one".