85028981 has 4 divisors (see below), whose sum is σ = 85520652. Its totient is φ = 84537312.

The previous prime is 85028929. The next prime is 85028987. The reversal of 85028981 is 18982058.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18982058 = 2 ⋅9491029.

It can be written as a sum of positive squares in 2 ways, for example, as 39250225 + 45778756 = 6265^2 + 6766^2 .

It is a cyclic number.

It is not a de Polignac number, because 85028981 - 2²⁶ = 17920117 is a prime.

It is a super-2 number, since 2×85028981² = 14459855219796722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85028987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245576 + ... + 245921.

It is an arithmetic number, because the mean of its divisors is an integer number (21380163).

Almost surely, 2^85028981 is an apocalyptic number.

It is an amenable number.

85028981 is a deficient number, since it is larger than the sum of its proper divisors (491671).

85028981 is a wasteful number, since it uses less digits than its factorization.

85028981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491670.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 85028981 is about 9221.1160387450. The cubic root of 85028981 is about 439.7329319380.

The spelling of 85028981 in words is "eighty-five million, twenty-eight thousand, nine hundred eighty-one".