216461953 has 2 divisors, whose sum is σ = 216461954. Its totient is φ = 216461952.

The previous prime is 216461929. The next prime is 216462007. The reversal of 216461953 is 359164612.

216461953 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., 138015504 + 78446449 = 11748^2 + 8857^2 .

It is a cyclic number.

It is not a de Polignac number, because 216461953 - 2¹³ = 216453761 is a prime.

It is not a weakly prime, because it can be changed into another prime (216468953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108230976 + 108230977.

It is an arithmetic number, because the mean of its divisors is an integer number (108230977).

Almost surely, 2^216461953 is an apocalyptic number.

It is an amenable number.

216461953 is a deficient number, since it is larger than the sum of its proper divisors (1).

216461953 is an equidigital number, since it uses as much as digits as its factorization.

216461953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 216461953 is about 14712.6460230646. The cubic root of 216461953 is about 600.4274296934.

The spelling of 216461953 in words is "two hundred sixteen million, four hundred sixty-one thousand, nine hundred fifty-three".