1231947863 has 2 divisors, whose sum is σ = 1231947864. Its totient is φ = 1231947862.

The previous prime is 1231947853. The next prime is 1231947881. The reversal of 1231947863 is 3687491321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231947863 - 2²² = 1227753559 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231947853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615973931 + 615973932.

It is an arithmetic number, because the mean of its divisors is an integer number (615973932).

Almost surely, 2^1231947863 is an apocalyptic number.

1231947863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231947863 is an equidigital number, since it uses as much as digits as its factorization.

1231947863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 1231947863 is about 35099.1148463889. The cubic root of 1231947863 is about 1072.0065596869.

The spelling of 1231947863 in words is "one billion, two hundred thirty-one million, nine hundred forty-seven thousand, eight hundred sixty-three".