85840819 has 2 divisors, whose sum is σ = 85840820. Its totient is φ = 85840818.

The previous prime is 85840813. The next prime is 85840823. The reversal of 85840819 is 91804858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85840819 - 2⁵ = 85840787 is a prime.

It is a super-2 number, since 2×85840819² = 14737292413181522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85840813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42920409 + 42920410.

It is an arithmetic number, because the mean of its divisors is an integer number (42920410).

Almost surely, 2^85840819 is an apocalyptic number.

85840819 is a deficient number, since it is larger than the sum of its proper divisors (1).

85840819 is an equidigital number, since it uses as much as digits as its factorization.

85840819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 85840819 is about 9265.0320560697. The cubic root of 85840819 is about 441.1279924935.

The spelling of 85840819 in words is "eighty-five million, eight hundred forty thousand, eight hundred nineteen".