1267979971 has 2 divisors, whose sum is σ = 1267979972. Its totient is φ = 1267979970.

The previous prime is 1267979929. The next prime is 1267980031. The reversal of 1267979971 is 1799797621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1267979971 - 2¹¹ = 1267977923 is a prime.

It is not a weakly prime, because it can be changed into another prime (1267979071) 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 as a sum of consecutive naturals, namely, 633989985 + 633989986.

It is an arithmetic number, because the mean of its divisors is an integer number (633989986).

Almost surely, 2^1267979971 is an apocalyptic number.

1267979971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267979971 is an equidigital number, since it uses as much as digits as its factorization.

1267979971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000564, while the sum is 58.

The square root of 1267979971 is about 35608.7063932404. The cubic root of 1267979971 is about 1082.3576669103.

The spelling of 1267979971 in words is "one billion, two hundred sixty-seven million, nine hundred seventy-nine thousand, nine hundred seventy-one".