213432449 has 2 divisors, whose sum is σ = 213432450. Its totient is φ = 213432448.

The previous prime is 213432421. The next prime is 213432451. The reversal of 213432449 is 944234312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181306225 + 32126224 = 13465^2 + 5668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213432449 is a prime.

It is a super-2 number, since 2×213432449² = 91106820572275202, which contains 22 as substring.

Together with 213432451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213432409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106716224 + 106716225.

It is an arithmetic number, because the mean of its divisors is an integer number (106716225).

Almost surely, 2^213432449 is an apocalyptic number.

It is an amenable number.

213432449 is a deficient number, since it is larger than the sum of its proper divisors (1).

213432449 is an equidigital number, since it uses as much as digits as its factorization.

213432449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 32.

The square root of 213432449 is about 14609.3274656981. The cubic root of 213432449 is about 597.6131555093.

The spelling of 213432449 in words is "two hundred thirteen million, four hundred thirty-two thousand, four hundred forty-nine".