1267788971 has 2 divisors, whose sum is σ = 1267788972. Its totient is φ = 1267788970.

The previous prime is 1267788961. The next prime is 1267788983. The reversal of 1267788971 is 1798877621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1267788971 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1267788961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633894485 + 633894486.

It is an arithmetic number, because the mean of its divisors is an integer number (633894486).

Almost surely, 2^1267788971 is an apocalyptic number.

1267788971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267788971 is an equidigital number, since it uses as much as digits as its factorization.

1267788971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2370816, while the sum is 56.

The square root of 1267788971 is about 35606.0243638629. The cubic root of 1267788971 is about 1082.3033178143.

The spelling of 1267788971 in words is "one billion, two hundred sixty-seven million, seven hundred eighty-eight thousand, nine hundred seventy-one".