85056981 has 16 divisors (see below), whose sum is σ = 116121600. Its totient is φ = 55354928.

The previous prime is 85056953. The next prime is 85056991. The reversal of 85056981 is 18965058.

It is a cyclic number.

It is not a de Polignac number, because 85056981 - 2¹⁷ = 84925909 is a prime.

It is a super-2 number, since 2×85056981² = 14469380033668722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85056911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100960 + ... + 101798.

It is an arithmetic number, because the mean of its divisors is an integer number (7257600).

Almost surely, 2^85056981 is an apocalyptic number.

It is an amenable number.

85056981 is a deficient number, since it is larger than the sum of its proper divisors (31064619).

85056981 is a wasteful number, since it uses less digits than its factorization.

85056981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608.

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 85056981 is about 9222.6341681756. The cubic root of 85056981 is about 439.7811945840.

The spelling of 85056981 in words is "eighty-five million, fifty-six thousand, nine hundred eighty-one".