985383581 has 24 divisors (see below), whose sum is σ = 1239555744. Its totient is φ = 776412000.

The previous prime is 985383557. The next prime is 985383583. The reversal of 985383581 is 185383589.

It is not a de Polignac number, because 985383581 - 2⁶ = 985383517 is a prime.

It is a super-2 number, since 2×985383581² = 1941961603408767122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985383583) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156806 + ... + 162968.

It is an arithmetic number, because the mean of its divisors is an integer number (51648156).

Almost surely, 2^985383581 is an apocalyptic number.

985383581 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

985383581 is a deficient number, since it is larger than the sum of its proper divisors (254172163).

985383581 is a wasteful number, since it uses less digits than its factorization.

985383581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6441 (or 6434 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 50.

The square root of 985383581 is about 31390.8200115894. The cubic root of 985383581 is about 995.1039279338.

The spelling of 985383581 in words is "nine hundred eighty-five million, three hundred eighty-three thousand, five hundred eighty-one".