85079381 has 2 divisors, whose sum is σ = 85079382. Its totient is φ = 85079380.

The previous prime is 85079341. The next prime is 85079389. The reversal of 85079381 is 18397058.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52200625 + 32878756 = 7225^2 + 5734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85079381 is a prime.

It is a super-2 number, since 2×85079381² = 14477002142686322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85079389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42539690 + 42539691.

It is an arithmetic number, because the mean of its divisors is an integer number (42539691).

Almost surely, 2^85079381 is an apocalyptic number.

It is an amenable number.

85079381 is a deficient number, since it is larger than the sum of its proper divisors (1).

85079381 is an equidigital number, since it uses as much as digits as its factorization.

85079381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 85079381 is about 9223.8484918173. The cubic root of 85079381 is about 439.8197970754.

The spelling of 85079381 in words is "eighty-five million, seventy-nine thousand, three hundred eighty-one".