216863461 has 2 divisors, whose sum is σ = 216863462. Its totient is φ = 216863460.

The previous prime is 216863429. The next prime is 216863467. The reversal of 216863461 is 164368612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146555236 + 70308225 = 12106^2 + 8385^2 .

It is a cyclic number.

It is not a de Polignac number, because 216863461 - 2⁵ = 216863429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216863461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216863467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108431730 + 108431731.

It is an arithmetic number, because the mean of its divisors is an integer number (108431731).

Almost surely, 2^216863461 is an apocalyptic number.

It is an amenable number.

216863461 is a deficient number, since it is larger than the sum of its proper divisors (1).

216863461 is an equidigital number, since it uses as much as digits as its factorization.

216863461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 37.

The square root of 216863461 is about 14726.2846977776. The cubic root of 216863461 is about 600.7984379494.

The spelling of 216863461 in words is "two hundred sixteen million, eight hundred sixty-three thousand, four hundred sixty-one".