215968253 has 2 divisors, whose sum is σ = 215968254. Its totient is φ = 215968252.

The previous prime is 215968219. The next prime is 215968283. The reversal of 215968253 is 352869512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214974244 + 994009 = 14662^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 215968253 - 2¹⁰ = 215967229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215968253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215968283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107984126 + 107984127.

It is an arithmetic number, because the mean of its divisors is an integer number (107984127).

Almost surely, 2^215968253 is an apocalyptic number.

It is an amenable number.

215968253 is a deficient number, since it is larger than the sum of its proper divisors (1).

215968253 is an equidigital number, since it uses as much as digits as its factorization.

215968253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 215968253 is about 14695.8583621373. The cubic root of 215968253 is about 599.9706031894.

The spelling of 215968253 in words is "two hundred fifteen million, nine hundred sixty-eight thousand, two hundred fifty-three".