213331939 has 2 divisors, whose sum is σ = 213331940. Its totient is φ = 213331938.

The previous prime is 213331927. The next prime is 213331949. The reversal of 213331939 is 939133312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213331939 is a prime.

It is not a weakly prime, because it can be changed into another prime (213331949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106665969 + 106665970.

It is an arithmetic number, because the mean of its divisors is an integer number (106665970).

Almost surely, 2^213331939 is an apocalyptic number.

213331939 is a deficient number, since it is larger than the sum of its proper divisors (1).

213331939 is an equidigital number, since it uses as much as digits as its factorization.

213331939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13122, while the sum is 34.

The square root of 213331939 is about 14605.8871349877. The cubic root of 213331939 is about 597.5193310856.

The spelling of 213331939 in words is "two hundred thirteen million, three hundred thirty-one thousand, nine hundred thirty-nine".