85402813 has 2 divisors, whose sum is σ = 85402814. Its totient is φ = 85402812.

The previous prime is 85402787. The next prime is 85402817. The reversal of 85402813 is 31820458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84143929 + 1258884 = 9173^2 + 1122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85402813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85402817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42701406 + 42701407.

It is an arithmetic number, because the mean of its divisors is an integer number (42701407).

Almost surely, 2^85402813 is an apocalyptic number.

It is an amenable number.

85402813 is a deficient number, since it is larger than the sum of its proper divisors (1).

85402813 is an equidigital number, since it uses as much as digits as its factorization.

85402813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 85402813 is about 9241.3642391153. The cubic root of 85402813 is about 440.3764220234.

The spelling of 85402813 in words is "eighty-five million, four hundred two thousand, eight hundred thirteen".