20231331977 has 2 divisors, whose sum is σ = 20231331978. Its totient is φ = 20231331976.

The previous prime is 20231331971. The next prime is 20231332057. The reversal of 20231331977 is 77913313202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13699297936 + 6532034041 = 117044^2 + 80821^2 .

It is a cyclic number.

It is not a de Polignac number, because 20231331977 - 2⁸ = 20231331721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20231331977.

It is not a weakly prime, because it can be changed into another prime (20231331971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10115665988 + 10115665989.

It is an arithmetic number, because the mean of its divisors is an integer number (10115665989).

Almost surely, 2^20231331977 is an apocalyptic number.

It is an amenable number.

20231331977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20231331977 is an equidigital number, since it uses as much as digits as its factorization.

20231331977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 38.

The spelling of 20231331977 in words is "twenty billion, two hundred thirty-one million, three hundred thirty-one thousand, nine hundred seventy-seven".