12031011961 has 2 divisors, whose sum is σ = 12031011962. Its totient is φ = 12031011960.

The previous prime is 12031011943. The next prime is 12031012027. The reversal of 12031011961 is 16911013021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11546791936 + 484220025 = 107456^2 + 22005^2 .

It is a cyclic number.

It is not a de Polignac number, because 12031011961 - 2¹⁷ = 12030880889 is a prime.

It is not a weakly prime, because it can be changed into another prime (12031011931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6015505980 + 6015505981.

It is an arithmetic number, because the mean of its divisors is an integer number (6015505981).

Almost surely, 2^12031011961 is an apocalyptic number.

It is an amenable number.

12031011961 is a deficient number, since it is larger than the sum of its proper divisors (1).

12031011961 is an equidigital number, since it uses as much as digits as its factorization.

12031011961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

Adding to 12031011961 its reverse (16911013021), we get a palindrome (28942024982).

The spelling of 12031011961 in words is "twelve billion, thirty-one million, eleven thousand, nine hundred sixty-one".