1231966969 has 2 divisors, whose sum is σ = 1231966970. Its totient is φ = 1231966968.

The previous prime is 1231966949. The next prime is 1231967021. The reversal of 1231966969 is 9696691321.

It is an a-pointer prime, because the next prime (1231967021) can be obtained adding 1231966969 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998244025 + 233722944 = 31595^2 + 15288^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231966969 - 2¹⁵ = 1231934201 is a prime.

It is a super-2 number, since 2×1231966969² = 3035485225414093922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1231966949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615983484 + 615983485.

It is an arithmetic number, because the mean of its divisors is an integer number (615983485).

Almost surely, 2^1231966969 is an apocalyptic number.

It is an amenable number.

1231966969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231966969 is an equidigital number, since it uses as much as digits as its factorization.

1231966969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 52.

The square root of 1231966969 is about 35099.3870174395. The cubic root of 1231966969 is about 1072.0121014938.

The spelling of 1231966969 in words is "one billion, two hundred thirty-one million, nine hundred sixty-six thousand, nine hundred sixty-nine".