216739057 has 2 divisors, whose sum is σ = 216739058. Its totient is φ = 216739056.

The previous prime is 216739027. The next prime is 216739091. The reversal of 216739057 is 750937612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216207616 + 531441 = 14704^2 + 729^2 .

It is a cyclic number.

It is not a de Polignac number, because 216739057 - 2¹⁵ = 216706289 is a prime.

It is not a weakly prime, because it can be changed into another prime (216739027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108369528 + 108369529.

It is an arithmetic number, because the mean of its divisors is an integer number (108369529).

Almost surely, 2^216739057 is an apocalyptic number.

It is an amenable number.

216739057 is a deficient number, since it is larger than the sum of its proper divisors (1).

216739057 is an equidigital number, since it uses as much as digits as its factorization.

216739057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 40.

The square root of 216739057 is about 14722.0602158801. The cubic root of 216739057 is about 600.6835330456.

The spelling of 216739057 in words is "two hundred sixteen million, seven hundred thirty-nine thousand, fifty-seven".