213444137 has 2 divisors, whose sum is σ = 213444138. Its totient is φ = 213444136.

The previous prime is 213444097. The next prime is 213444149. The reversal of 213444137 is 731444312.

213444137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186704896 + 26739241 = 13664^2 + 5171^2 .

It is a cyclic number.

It is not a de Polignac number, because 213444137 - 2¹⁸ = 213181993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213444337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106722068 + 106722069.

It is an arithmetic number, because the mean of its divisors is an integer number (106722069).

Almost surely, 2^213444137 is an apocalyptic number.

It is an amenable number.

213444137 is a deficient number, since it is larger than the sum of its proper divisors (1).

213444137 is an equidigital number, since it uses as much as digits as its factorization.

213444137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 29.

The square root of 213444137 is about 14609.7274786356. The cubic root of 213444137 is about 597.6240641521.

Adding to 213444137 its reverse (731444312), we get a palindrome (944888449).

The spelling of 213444137 in words is "two hundred thirteen million, four hundred forty-four thousand, one hundred thirty-seven".