216654901 has 2 divisors, whose sum is σ = 216654902. Its totient is φ = 216654900.

The previous prime is 216654883. The next prime is 216654959. The reversal of 216654901 is 109456612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146531025 + 70123876 = 12105^2 + 8374^2 .

It is a cyclic number.

It is not a de Polignac number, because 216654901 - 2¹⁹ = 216130613 is a prime.

It is a super-2 number, since 2×216654901² = 93878692254639602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216654961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108327450 + 108327451.

It is an arithmetic number, because the mean of its divisors is an integer number (108327451).

Almost surely, 2^216654901 is an apocalyptic number.

It is an amenable number.

216654901 is a deficient number, since it is larger than the sum of its proper divisors (1).

216654901 is an equidigital number, since it uses as much as digits as its factorization.

216654901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 216654901 is about 14719.2017786292. The cubic root of 216654901 is about 600.6057779973.

The spelling of 216654901 in words is "two hundred sixteen million, six hundred fifty-four thousand, nine hundred one".