1266831971 has 4 divisors (see below), whose sum is σ = 1268061744. Its totient is φ = 1265602200.

The previous prime is 1266831953. The next prime is 1266831989. The reversal of 1266831971 is 1791386621.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1266831953) and next prime (1266831989).

It is a cyclic number.

It is not a de Polignac number, because 1266831971 - 2²² = 1262637667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266831941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613340 + ... + 615401.

It is an arithmetic number, because the mean of its divisors is an integer number (317015436).

Almost surely, 2^1266831971 is an apocalyptic number.

1266831971 is a deficient number, since it is larger than the sum of its proper divisors (1229773).

1266831971 is a wasteful number, since it uses less digits than its factorization.

1266831971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229772.

The product of its digits is 108864, while the sum is 44.

The square root of 1266831971 is about 35592.5830897394. The cubic root of 1266831971 is about 1082.0309210074.

The spelling of 1266831971 in words is "one billion, two hundred sixty-six million, eight hundred thirty-one thousand, nine hundred seventy-one".