31233091997 has 2 divisors, whose sum is σ = 31233091998. Its totient is φ = 31233091996.

The previous prime is 31233091973. The next prime is 31233092021. The reversal of 31233091997 is 79919033213.

It is a balanced prime because it is at equal distance from previous prime (31233091973) and next prime (31233092021).

It can be written as a sum of positive squares in only one way, i.e., 27573930916 + 3659161081 = 166054^2 + 60491^2 .

It is a cyclic number.

It is not a de Polignac number, because 31233091997 - 2¹² = 31233087901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31233091957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15616545998 + 15616545999.

It is an arithmetic number, because the mean of its divisors is an integer number (15616545999).

Almost surely, 2^31233091997 is an apocalyptic number.

It is an amenable number.

31233091997 is a deficient number, since it is larger than the sum of its proper divisors (1).

31233091997 is an equidigital number, since it uses as much as digits as its factorization.

31233091997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 275562, while the sum is 47.

The spelling of 31233091997 in words is "thirty-one billion, two hundred thirty-three million, ninety-one thousand, nine hundred ninety-seven".