85281993 has 6 divisors (see below), whose sum is σ = 123185114. Its totient is φ = 56854656.

The previous prime is 85281991. The next prime is 85282007. The reversal of 85281993 is 39918258.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 78375609 + 6906384 = 8853^2 + 2628^2 .

It is not a de Polignac number, because 85281993 - 2¹ = 85281991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85281991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4737880 + ... + 4737897.

Almost surely, 2^85281993 is an apocalyptic number.

It is an amenable number.

85281993 is a deficient number, since it is larger than the sum of its proper divisors (37903121).

85281993 is a wasteful number, since it uses less digits than its factorization.

85281993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9475783 (or 9475780 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 85281993 is about 9234.8250118776. The cubic root of 85281993 is about 440.1686560743.

The spelling of 85281993 in words is "eighty-five million, two hundred eighty-one thousand, nine hundred ninety-three".