3231997558781 has 2 divisors, whose sum is σ = 3231997558782. Its totient is φ = 3231997558780.

The previous prime is 3231997558721. The next prime is 3231997558831. The reversal of 3231997558781 is 1878557991323.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2995962883225 + 236034675556 = 1730885^2 + 485834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3231997558781 is a prime.

It is a super-2 number, since 2×3231997558781² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3231997558721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1615998779390 + 1615998779391.

It is an arithmetic number, because the mean of its divisors is an integer number (1615998779391).

Almost surely, 2^{3231997558781} is an apocalyptic number.

It is an amenable number.

3231997558781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3231997558781 is an equidigital number, since it uses as much as digits as its factorization.

3231997558781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 114307200, while the sum is 68.

The spelling of 3231997558781 in words is "three trillion, two hundred thirty-one billion, nine hundred ninety-seven million, five hundred fifty-eight thousand, seven hundred eighty-one".