216245437 has 2 divisors, whose sum is σ = 216245438. Its totient is φ = 216245436.

The previous prime is 216245413. The next prime is 216245467. The reversal of 216245437 is 734542612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199769956 + 16475481 = 14134^2 + 4059^2 .

It is a cyclic number.

It is not a de Polignac number, because 216245437 - 2¹⁵ = 216212669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216245467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108122718 + 108122719.

It is an arithmetic number, because the mean of its divisors is an integer number (108122719).

Almost surely, 2^216245437 is an apocalyptic number.

It is an amenable number.

216245437 is a deficient number, since it is larger than the sum of its proper divisors (1).

216245437 is an equidigital number, since it uses as much as digits as its factorization.

216245437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 34.

The square root of 216245437 is about 14705.2860223798. The cubic root of 216245437 is about 600.2271704599.

The spelling of 216245437 in words is "two hundred sixteen million, two hundred forty-five thousand, four hundred thirty-seven".