1297779047 has 2 divisors, whose sum is σ = 1297779048. Its totient is φ = 1297779046.

The previous prime is 1297779037. The next prime is 1297779073. The reversal of 1297779047 is 7409777921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1297779047 - 2⁸ = 1297778791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1297779047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1297779037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 648889523 + 648889524.

It is an arithmetic number, because the mean of its divisors is an integer number (648889524).

Almost surely, 2^1297779047 is an apocalyptic number.

1297779047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1297779047 is an equidigital number, since it uses as much as digits as its factorization.

1297779047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555848, while the sum is 53.

The square root of 1297779047 is about 36024.7005122874. The cubic root of 1297779047 is about 1090.7710076820.

The spelling of 1297779047 in words is "one billion, two hundred ninety-seven million, seven hundred seventy-nine thousand, forty-seven".