85811213 has 2 divisors, whose sum is σ = 85811214. Its totient is φ = 85811212.

The previous prime is 85811207. The next prime is 85811267. The reversal of 85811213 is 31211858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85784644 + 26569 = 9262^2 + 163^2 .

It is a cyclic number.

It is not a de Polignac number, because 85811213 - 2¹⁴ = 85794829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85801213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42905606 + 42905607.

It is an arithmetic number, because the mean of its divisors is an integer number (42905607).

Almost surely, 2^85811213 is an apocalyptic number.

It is an amenable number.

85811213 is a deficient number, since it is larger than the sum of its proper divisors (1).

85811213 is an equidigital number, since it uses as much as digits as its factorization.

85811213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 29.

The square root of 85811213 is about 9263.4341904069. The cubic root of 85811213 is about 441.0772725011.

The spelling of 85811213 in words is "eighty-five million, eight hundred eleven thousand, two hundred thirteen".