331045531381 has 2 divisors, whose sum is σ = 331045531382. Its totient is φ = 331045531380.

The previous prime is 331045531343. The next prime is 331045531387. The reversal of 331045531381 is 183135540133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167227016356 + 163818515025 = 408934^2 + 404745^2 .

It is a cyclic number.

It is not a de Polignac number, because 331045531381 - 2⁹ = 331045530869 is a prime.

It is a super-2 number, since 2×331045531381² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 331045531381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331045531387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165522765690 + 165522765691.

It is an arithmetic number, because the mean of its divisors is an integer number (165522765691).

Almost surely, 2^331045531381 is an apocalyptic number.

It is an amenable number.

331045531381 is a deficient number, since it is larger than the sum of its proper divisors (1).

331045531381 is an equidigital number, since it uses as much as digits as its factorization.

331045531381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 331045531381 in words is "three hundred thirty-one billion, forty-five million, five hundred thirty-one thousand, three hundred eighty-one".