214861681 has 2 divisors, whose sum is σ = 214861682. Its totient is φ = 214861680.

The previous prime is 214861663. The next prime is 214861721. The reversal of 214861681 is 186168412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164224225 + 50637456 = 12815^2 + 7116^2 .

It is a cyclic number.

It is not a de Polignac number, because 214861681 - 2¹¹ = 214859633 is a prime.

It is a super-2 number, since 2×214861681² = 92331083924291522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 214861681.

It is not a weakly prime, because it can be changed into another prime (214861081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107430840 + 107430841.

It is an arithmetic number, because the mean of its divisors is an integer number (107430841).

Almost surely, 2^214861681 is an apocalyptic number.

It is an amenable number.

214861681 is a deficient number, since it is larger than the sum of its proper divisors (1).

214861681 is an equidigital number, since it uses as much as digits as its factorization.

214861681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The square root of 214861681 is about 14658.1609010135. The cubic root of 214861681 is about 598.9441439625.

The spelling of 214861681 in words is "two hundred fourteen million, eight hundred sixty-one thousand, six hundred eighty-one".