213813923 has 2 divisors, whose sum is σ = 213813924. Its totient is φ = 213813922.

The previous prime is 213813907. The next prime is 213813937. The reversal of 213813923 is 329318312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213813923 - 2⁴ = 213813907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213813923.

It is not a weakly prime, because it can be changed into another prime (213813983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106906961 + 106906962.

It is an arithmetic number, because the mean of its divisors is an integer number (106906962).

Almost surely, 2^213813923 is an apocalyptic number.

213813923 is a deficient number, since it is larger than the sum of its proper divisors (1).

213813923 is an equidigital number, since it uses as much as digits as its factorization.

213813923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 213813923 is about 14622.3774742687. The cubic root of 213813923 is about 597.9689873665.

It can be divided in two parts, 2138 and 13923, that added together give a palindrome (16061).

The spelling of 213813923 in words is "two hundred thirteen million, eight hundred thirteen thousand, nine hundred twenty-three".