216441457 has 2 divisors, whose sum is σ = 216441458. Its totient is φ = 216441456.

The previous prime is 216441451. The next prime is 216441493. The reversal of 216441457 is 754144612.

216441457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144937521 + 71503936 = 12039^2 + 8456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216441457 is a prime.

It is not a weakly prime, because it can be changed into another prime (216441451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108220728 + 108220729.

It is an arithmetic number, because the mean of its divisors is an integer number (108220729).

Almost surely, 2^216441457 is an apocalyptic number.

It is an amenable number.

216441457 is a deficient number, since it is larger than the sum of its proper divisors (1).

216441457 is an equidigital number, since it uses as much as digits as its factorization.

216441457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 34.

The square root of 216441457 is about 14711.9494629366. The cubic root of 216441457 is about 600.4084783275.

The spelling of 216441457 in words is "two hundred sixteen million, four hundred forty-one thousand, four hundred fifty-seven".