331005401 has 2 divisors, whose sum is σ = 331005402. Its totient is φ = 331005400.

The previous prime is 331005361. The next prime is 331005407. The reversal of 331005401 is 104500133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 297597001 + 33408400 = 17251^2 + 5780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331005401 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 331005401.

It is not a weakly prime, because it can be changed into another prime (331005407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165502700 + 165502701.

It is an arithmetic number, because the mean of its divisors is an integer number (165502701).

Almost surely, 2^331005401 is an apocalyptic number.

It is an amenable number.

331005401 is a deficient number, since it is larger than the sum of its proper divisors (1).

331005401 is an equidigital number, since it uses as much as digits as its factorization.

331005401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 331005401 is about 18193.5538309589. The cubic root of 331005401 is about 691.7434040632.

Adding to 331005401 its reverse (104500133), we get a palindrome (435505534).

The spelling of 331005401 in words is "three hundred thirty-one million, five thousand, four hundred one".