213404161 has 2 divisors, whose sum is σ = 213404162. Its totient is φ = 213404160.

The previous prime is 213404131. The next prime is 213404167. The reversal of 213404161 is 161404312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123988225 + 89415936 = 11135^2 + 9456^2 .

It is a cyclic number.

It is not a de Polignac number, because 213404161 - 2²¹ = 211307009 is a prime.

It is a super-2 number, since 2×213404161² = 91082671864227842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213404167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106702080 + 106702081.

It is an arithmetic number, because the mean of its divisors is an integer number (106702081).

Almost surely, 2^213404161 is an apocalyptic number.

It is an amenable number.

213404161 is a deficient number, since it is larger than the sum of its proper divisors (1).

213404161 is an equidigital number, since it uses as much as digits as its factorization.

213404161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 213404161 is about 14608.3592850121. The cubic root of 213404161 is about 597.5867521079.

Adding to 213404161 its reverse (161404312), we get a palindrome (374808473).

The spelling of 213404161 in words is "two hundred thirteen million, four hundred four thousand, one hundred sixty-one".