985999261 has 16 divisors (see below), whose sum is σ = 1070033328. Its totient is φ = 903168000.

The previous prime is 985999253. The next prime is 985999279. The reversal of 985999261 is 162999589.

It can be written as a sum of positive squares in 8 ways, for example, as 416025 + 985583236 = 645^2 + 31394^2 .

It is a cyclic number.

It is not a de Polignac number, because 985999261 - 2³ = 985999253 is a prime.

It is a super-2 number, since 2×985999261² = 1944389085385092242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 985999196 and 985999205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985999961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1406211 + ... + 1406911.

It is an arithmetic number, because the mean of its divisors is an integer number (66877083).

Almost surely, 2^985999261 is an apocalyptic number.

It is an amenable number.

985999261 is a deficient number, since it is larger than the sum of its proper divisors (84034067).

985999261 is a wasteful number, since it uses less digits than its factorization.

985999261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392.

The product of its digits is 3149280, while the sum is 58.

The square root of 985999261 is about 31400.6251689357. The cubic root of 985999261 is about 995.3111359159.

The spelling of 985999261 in words is "nine hundred eighty-five million, nine hundred ninety-nine thousand, two hundred sixty-one".