985581101 has 4 divisors (see below), whose sum is σ = 988506012. Its totient is φ = 982656192.

The previous prime is 985581089. The next prime is 985581127. The reversal of 985581101 is 101185589.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101185589 = 719 ⋅140731.

It can be written as a sum of positive squares in 2 ways, for example, as 251983876 + 733597225 = 15874^2 + 27085^2 .

It is a cyclic number.

It is not a de Polignac number, because 985581101 - 2¹⁰ = 985580077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985584101) 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, 1461950 + ... + 1462623.

It is an arithmetic number, because the mean of its divisors is an integer number (247126503).

Almost surely, 2^985581101 is an apocalyptic number.

It is an amenable number.

985581101 is a deficient number, since it is larger than the sum of its proper divisors (2924911).

985581101 is a wasteful number, since it uses less digits than its factorization.

985581101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2924910.

The product of its (nonzero) digits is 14400, while the sum is 38.

The square root of 985581101 is about 31393.9659966689. The cubic root of 985581101 is about 995.1704129724.

The spelling of 985581101 in words is "nine hundred eighty-five million, five hundred eighty-one thousand, one hundred one".