9981505 has 4 divisors (see below), whose sum is σ = 11977812. Its totient is φ = 7985200.

The previous prime is 9981467. The next prime is 9981551. The reversal of 9981505 is 5051899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5051899 = 491 ⋅10289.

It can be written as a sum of positive squares in 2 ways, for example, as 1640961 + 8340544 = 1281^2 + 2888^2 .

It is not a de Polignac number, because 9981505 - 2¹⁷ = 9850433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998146 + ... + 998155.

It is an arithmetic number, because the mean of its divisors is an integer number (2994453).

Almost surely, 2^9981505 is an apocalyptic number.

It is an amenable number.

9981505 is a deficient number, since it is larger than the sum of its proper divisors (1996307).

9981505 is a wasteful number, since it uses less digits than its factorization.

9981505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996306.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 9981505 is about 3159.3519905196. The cubic root of 9981505 is about 215.3105661362.

It can be divided in two parts, 9981 and 505, that multiplied together give a palindrome (5040405).

The spelling of 9981505 in words is "nine million, nine hundred eighty-one thousand, five hundred five".