85663213 has 2 divisors, whose sum is σ = 85663214. Its totient is φ = 85663212.

The previous prime is 85663169. The next prime is 85663241. The reversal of 85663213 is 31236658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81324324 + 4338889 = 9018^2 + 2083^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85663213 is a prime.

It is a super-2 number, since 2×85663213² = 14676372122966738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85663313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42831606 + 42831607.

It is an arithmetic number, because the mean of its divisors is an integer number (42831607).

Almost surely, 2^85663213 is an apocalyptic number.

It is an amenable number.

85663213 is a deficient number, since it is larger than the sum of its proper divisors (1).

85663213 is an equidigital number, since it uses as much as digits as its factorization.

85663213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 85663213 is about 9255.4423449125. The cubic root of 85663213 is about 440.8235488538.

The spelling of 85663213 in words is "eighty-five million, six hundred sixty-three thousand, two hundred thirteen".