213447973 has 2 divisors, whose sum is σ = 213447974. Its totient is φ = 213447972.

The previous prime is 213447961. The next prime is 213447977. The reversal of 213447973 is 379744312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127644804 + 85803169 = 11298^2 + 9263^2 .

It is a cyclic number.

It is not a de Polignac number, because 213447973 - 2¹³ = 213439781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213447977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106723986 + 106723987.

It is an arithmetic number, because the mean of its divisors is an integer number (106723987).

Almost surely, 2^213447973 is an apocalyptic number.

It is an amenable number.

213447973 is a deficient number, since it is larger than the sum of its proper divisors (1).

213447973 is an equidigital number, since it uses as much as digits as its factorization.

213447973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 40.

The square root of 213447973 is about 14609.8587604398. The cubic root of 213447973 is about 597.6276442804.

The spelling of 213447973 in words is "two hundred thirteen million, four hundred forty-seven thousand, nine hundred seventy-three".