331231120309 has 4 divisors (see below), whose sum is σ = 334952818380. Its totient is φ = 327509422240.

The previous prime is 331231120307. The next prime is 331231120331. The reversal of 331231120309 is 903021132133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903021132133 = 19 ⋅47527428007.

It can be written as a sum of positive squares in 2 ways, for example, as 35615993284 + 295615127025 = 188722^2 + 543705^2 .

It is a cyclic number.

It is not a de Polignac number, because 331231120309 - 2¹ = 331231120307 is a prime.

It is a super-2 number, since 2×331231120309² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331231120307) 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 in 3 ways as a sum of consecutive naturals, for example, 1860848902 + ... + 1860849079.

It is an arithmetic number, because the mean of its divisors is an integer number (83738204595).

Almost surely, 2^331231120309 is an apocalyptic number.

It is an amenable number.

331231120309 is a deficient number, since it is larger than the sum of its proper divisors (3721698071).

331231120309 is an equidigital number, since it uses as much as digits as its factorization.

331231120309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3721698070.

The product of its (nonzero) digits is 2916, while the sum is 28.

The spelling of 331231120309 in words is "three hundred thirty-one billion, two hundred thirty-one million, one hundred twenty thousand, three hundred nine".