216265457 has 2 divisors, whose sum is σ = 216265458. Its totient is φ = 216265456.

The previous prime is 216265453. The next prime is 216265463. The reversal of 216265457 is 754562612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190550416 + 25715041 = 13804^2 + 5071^2 .

It is a cyclic number.

It is not a de Polignac number, because 216265457 - 2² = 216265453 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216265457.

It is not a weakly prime, because it can be changed into another prime (216265451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108132728 + 108132729.

It is an arithmetic number, because the mean of its divisors is an integer number (108132729).

Almost surely, 2^216265457 is an apocalyptic number.

It is an amenable number.

216265457 is a deficient number, since it is larger than the sum of its proper divisors (1).

216265457 is an equidigital number, since it uses as much as digits as its factorization.

216265457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 38.

The square root of 216265457 is about 14705.9667142286. The cubic root of 216265457 is about 600.2456928965.

The spelling of 216265457 in words is "two hundred sixteen million, two hundred sixty-five thousand, four hundred fifty-seven".