215953 has 2 divisors, whose sum is σ = 215954. Its totient is φ = 215952.

The previous prime is 215939. The next prime is 215959. The reversal of 215953 is 359512.

215953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154449 + 61504 = 393^2 + 248^2 .

It is a cyclic number.

It is not a de Polignac number, because 215953 - 2⁵ = 215921 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (215959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107976 + 107977.

It is an arithmetic number, because the mean of its divisors is an integer number (107977).

2²¹⁵⁹⁵³ is an apocalyptic number.

It is an amenable number.

215953 is a deficient number, since it is larger than the sum of its proper divisors (1).

215953 is an equidigital number, since it uses as much as digits as its factorization.

215953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1350, while the sum is 25.

The square root of 215953 is about 464.7074348448. The cubic root of 215953 is about 59.9956478325.

The spelling of 215953 in words is "two hundred fifteen thousand, nine hundred fifty-three".