1231942667 has 2 divisors, whose sum is σ = 1231942668. Its totient is φ = 1231942666.

The previous prime is 1231942661. The next prime is 1231942693. The reversal of 1231942667 is 7662491321.

It is a weak prime.

It is an emirp because it is prime and its reverse (7662491321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231942667 - 2⁶ = 1231942603 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231942661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615971333 + 615971334.

It is an arithmetic number, because the mean of its divisors is an integer number (615971334).

Almost surely, 2^1231942667 is an apocalyptic number.

1231942667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231942667 is an equidigital number, since it uses as much as digits as its factorization.

1231942667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 1231942667 is about 35099.0408273503. The cubic root of 1231942667 is about 1072.0050525468.

The spelling of 1231942667 in words is "one billion, two hundred thirty-one million, nine hundred forty-two thousand, six hundred sixty-seven".