331213139 has 2 divisors, whose sum is σ = 331213140. Its totient is φ = 331213138.

The previous prime is 331213117. The next prime is 331213151. The reversal of 331213139 is 931312133.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331213139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (331213189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165606569 + 165606570.

It is an arithmetic number, because the mean of its divisors is an integer number (165606570).

Almost surely, 2^331213139 is an apocalyptic number.

331213139 is a deficient number, since it is larger than the sum of its proper divisors (1).

331213139 is an equidigital number, since it uses as much as digits as its factorization.

331213139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 26.

The square root of 331213139 is about 18199.2620454787. The cubic root of 331213139 is about 691.8880858309. Note that the first 3 decimals are identical.

The spelling of 331213139 in words is "three hundred thirty-one million, two hundred thirteen thousand, one hundred thirty-nine".