1688046947 has 2 divisors, whose sum is σ = 1688046948. Its totient is φ = 1688046946.

The previous prime is 1688046931. The next prime is 1688046953. The reversal of 1688046947 is 7496408861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1688046947 - 2⁴ = 1688046931 is a prime.

It is not a weakly prime, because it can be changed into another prime (1688046907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844023473 + 844023474.

It is an arithmetic number, because the mean of its divisors is an integer number (844023474).

Almost surely, 2^1688046947 is an apocalyptic number.

1688046947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688046947 is an equidigital number, since it uses as much as digits as its factorization.

1688046947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The square root of 1688046947 is about 41085.8485004265. The cubic root of 1688046947 is about 1190.6794008959.

The spelling of 1688046947 in words is "one billion, six hundred eighty-eight million, forty-six thousand, nine hundred forty-seven".