1231687147 has 2 divisors, whose sum is σ = 1231687148. Its totient is φ = 1231687146.

The previous prime is 1231687057. The next prime is 1231687151. The reversal of 1231687147 is 7417861321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231687147 - 2¹⁹ = 1231162859 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231687157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615843573 + 615843574.

It is an arithmetic number, because the mean of its divisors is an integer number (615843574).

Almost surely, 2^1231687147 is an apocalyptic number.

1231687147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231687147 is an equidigital number, since it uses as much as digits as its factorization.

1231687147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 40.

The square root of 1231687147 is about 35095.4006530770. The cubic root of 1231687147 is about 1071.9309317622.

The spelling of 1231687147 in words is "one billion, two hundred thirty-one million, six hundred eighty-seven thousand, one hundred forty-seven".