85815413 has 2 divisors, whose sum is σ = 85815414. Its totient is φ = 85815412.

The previous prime is 85815397. The next prime is 85815421. The reversal of 85815413 is 31451858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84511249 + 1304164 = 9193^2 + 1142^2 .

It is a cyclic number.

It is not a de Polignac number, because 85815413 - 2⁴ = 85815397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85815463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42907706 + 42907707.

It is an arithmetic number, because the mean of its divisors is an integer number (42907707).

Almost surely, 2^85815413 is an apocalyptic number.

It is an amenable number.

85815413 is a deficient number, since it is larger than the sum of its proper divisors (1).

85815413 is an equidigital number, since it uses as much as digits as its factorization.

85815413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 35.

The square root of 85815413 is about 9263.6608854167. The cubic root of 85815413 is about 441.0844685083.

The spelling of 85815413 in words is "eighty-five million, eight hundred fifteen thousand, four hundred thirteen".