1261704947 has 2 divisors, whose sum is σ = 1261704948. Its totient is φ = 1261704946.

The previous prime is 1261704889. The next prime is 1261704953. The reversal of 1261704947 is 7494071621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1261704947 - 2¹⁴ = 1261688563 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261704047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630852473 + 630852474.

It is an arithmetic number, because the mean of its divisors is an integer number (630852474).

Almost surely, 2^1261704947 is an apocalyptic number.

1261704947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261704947 is an equidigital number, since it uses as much as digits as its factorization.

1261704947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 1261704947 is about 35520.4863001621. The cubic root of 1261704947 is about 1080.5692435219.

The spelling of 1261704947 in words is "one billion, two hundred sixty-one million, seven hundred four thousand, nine hundred forty-seven".