85779983 has 2 divisors, whose sum is σ = 85779984. Its totient is φ = 85779982.

The previous prime is 85779973. The next prime is 85779989. The reversal of 85779983 is 38997758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85779983 - 2²⁰ = 84731407 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85779989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42889991 + 42889992.

It is an arithmetic number, because the mean of its divisors is an integer number (42889992).

Almost surely, 2^85779983 is an apocalyptic number.

85779983 is a deficient number, since it is larger than the sum of its proper divisors (1).

85779983 is an equidigital number, since it uses as much as digits as its factorization.

85779983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 56.

The square root of 85779983 is about 9261.7483770614. The cubic root of 85779983 is about 441.0237576820.

The spelling of 85779983 in words is "eighty-five million, seven hundred seventy-nine thousand, nine hundred eighty-three".