215653 has 2 divisors, whose sum is σ = 215654. Its totient is φ = 215652.

The previous prime is 215617. The next prime is 215659. The reversal of 215653 is 356512.

It is a happy number.

215653 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., 213444 + 2209 = 462^2 + 47^2 .

It is a cyclic number.

It is not a de Polignac number, because 215653 - 2⁹ = 215141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107826 + 107827.

It is an arithmetic number, because the mean of its divisors is an integer number (107827).

2²¹⁵⁶⁵³ is an apocalyptic number.

It is an amenable number.

215653 is a deficient number, since it is larger than the sum of its proper divisors (1).

215653 is an equidigital number, since it uses as much as digits as its factorization.

215653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 22.

The square root of 215653 is about 464.3845389330. The cubic root of 215653 is about 59.9678531498.

It can be divided in two parts, 2156 and 53, that added together give a square (2209 = 47²).

The spelling of 215653 in words is "two hundred fifteen thousand, six hundred fifty-three".