80185813 has 2 divisors, whose sum is σ = 80185814. Its totient is φ = 80185812.

The previous prime is 80185793. The next prime is 80185823. The reversal of 80185813 is 31858108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79869969 + 315844 = 8937^2 + 562^2 .

It is a cyclic number.

It is not a de Polignac number, because 80185813 - 2²⁵ = 46631381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80185823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40092906 + 40092907.

It is an arithmetic number, because the mean of its divisors is an integer number (40092907).

Almost surely, 2^80185813 is an apocalyptic number.

It is an amenable number.

80185813 is a deficient number, since it is larger than the sum of its proper divisors (1).

80185813 is an equidigital number, since it uses as much as digits as its factorization.

80185813 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 34.

The square root of 80185813 is about 8954.6531479449. The cubic root of 80185813 is about 431.2202817020.

It can be divided in two parts, 8018 and 5813, that added together give a palindrome (13831).

The spelling of 80185813 in words is "eighty million, one hundred eighty-five thousand, eight hundred thirteen".