85210813 has 2 divisors, whose sum is σ = 85210814. Its totient is φ = 85210812.

The previous prime is 85210799. The next prime is 85210823. The reversal of 85210813 is 31801258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44595684 + 40615129 = 6678^2 + 6373^2 .

It is a cyclic number.

It is not a de Polignac number, because 85210813 - 2⁵ = 85210781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85210823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42605406 + 42605407.

It is an arithmetic number, because the mean of its divisors is an integer number (42605407).

Almost surely, 2^85210813 is an apocalyptic number.

It is an amenable number.

85210813 is a deficient number, since it is larger than the sum of its proper divisors (1).

85210813 is an equidigital number, since it uses as much as digits as its factorization.

85210813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 85210813 is about 9230.9703173610. The cubic root of 85210813 is about 440.0461607907.

The spelling of 85210813 in words is "eighty-five million, two hundred ten thousand, eight hundred thirteen".