331203121 has 2 divisors, whose sum is σ = 331203122. Its totient is φ = 331203120.

The previous prime is 331203091. The next prime is 331203161. The reversal of 331203121 is 121302133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286794225 + 44408896 = 16935^2 + 6664^2 .

It is a cyclic number.

It is not a de Polignac number, because 331203121 - 2⁹ = 331202609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331203095 and 331203104.

It is not a weakly prime, because it can be changed into another prime (331203161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165601560 + 165601561.

It is an arithmetic number, because the mean of its divisors is an integer number (165601561).

Almost surely, 2^331203121 is an apocalyptic number.

It is an amenable number.

331203121 is a deficient number, since it is larger than the sum of its proper divisors (1).

331203121 is an equidigital number, since it uses as much as digits as its factorization.

331203121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 331203121 is about 18198.9868124574. The cubic root of 331203121 is about 691.8811100562.

Adding to 331203121 its reverse (121302133), we get a palindrome (452505254).

The spelling of 331203121 in words is "three hundred thirty-one million, two hundred three thousand, one hundred twenty-one".