213449437 has 2 divisors, whose sum is σ = 213449438. Its totient is φ = 213449436.

The previous prime is 213449417. The next prime is 213449443. The reversal of 213449437 is 734944312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135815716 + 77633721 = 11654^2 + 8811^2 .

It is a cyclic number.

It is not a de Polignac number, because 213449437 - 2¹⁹ = 212925149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213449396 and 213449405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213449417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106724718 + 106724719.

It is an arithmetic number, because the mean of its divisors is an integer number (106724719).

Almost surely, 2^213449437 is an apocalyptic number.

It is an amenable number.

213449437 is a deficient number, since it is larger than the sum of its proper divisors (1).

213449437 is an equidigital number, since it uses as much as digits as its factorization.

213449437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 37.

The square root of 213449437 is about 14609.9088635077. The cubic root of 213449437 is about 597.6290106162.

The spelling of 213449437 in words is "two hundred thirteen million, four hundred forty-nine thousand, four hundred thirty-seven".