85969879 has 2 divisors, whose sum is σ = 85969880. Its totient is φ = 85969878.

The previous prime is 85969861. The next prime is 85969937. The reversal of 85969879 is 97896958.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85969879 - 2⁵ = 85969847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85969859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42984939 + 42984940.

It is an arithmetic number, because the mean of its divisors is an integer number (42984940).

Almost surely, 2^85969879 is an apocalyptic number.

85969879 is a deficient number, since it is larger than the sum of its proper divisors (1).

85969879 is an equidigital number, since it uses as much as digits as its factorization.

85969879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 61.

The square root of 85969879 is about 9271.9943377895. The cubic root of 85969879 is about 441.3489575742.

The spelling of 85969879 in words is "eighty-five million, nine hundred sixty-nine thousand, eight hundred seventy-nine".