331140421 has 2 divisors, whose sum is σ = 331140422. Its totient is φ = 331140420.

The previous prime is 331140413. The next prime is 331140437. The reversal of 331140421 is 124041133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199120321 + 132020100 = 14111^2 + 11490^2 .

It is a cyclic number.

It is not a de Polignac number, because 331140421 - 2³ = 331140413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331140401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165570210 + 165570211.

It is an arithmetic number, because the mean of its divisors is an integer number (165570211).

Almost surely, 2^331140421 is an apocalyptic number.

It is an amenable number.

331140421 is a deficient number, since it is larger than the sum of its proper divisors (1).

331140421 is an equidigital number, since it uses as much as digits as its factorization.

331140421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 331140421 is about 18197.2641075520. The cubic root of 331140421 is about 691.8374473402.

Adding to 331140421 its reverse (124041133), we get a palindrome (455181554).

The spelling of 331140421 in words is "three hundred thirty-one million, one hundred forty thousand, four hundred twenty-one".