216892457 has 2 divisors, whose sum is σ = 216892458. Its totient is φ = 216892456.

The previous prime is 216892447. The next prime is 216892471. The reversal of 216892457 is 754298612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213861376 + 3031081 = 14624^2 + 1741^2 .

It is a cyclic number.

It is not a de Polignac number, because 216892457 - 2⁴ = 216892441 is a prime.

It is not a weakly prime, because it can be changed into another prime (216892427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108446228 + 108446229.

It is an arithmetic number, because the mean of its divisors is an integer number (108446229).

Almost surely, 2^216892457 is an apocalyptic number.

It is an amenable number.

216892457 is a deficient number, since it is larger than the sum of its proper divisors (1).

216892457 is an equidigital number, since it uses as much as digits as its factorization.

216892457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 216892457 is about 14727.2691630186. The cubic root of 216892457 is about 600.8252135913.

The spelling of 216892457 in words is "two hundred sixteen million, eight hundred ninety-two thousand, four hundred fifty-seven".