981009541 has 4 divisors (see below), whose sum is σ = 981928300. Its totient is φ = 980090784.

The previous prime is 981009529. The next prime is 981009553. The reversal of 981009541 is 145900189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145900189 = 29 ⋅5031041.

It is an interprime number because it is at equal distance from previous prime (981009529) and next prime (981009553).

It can be written as a sum of positive squares in 2 ways, for example, as 582208641 + 398800900 = 24129^2 + 19970^2 .

It is a cyclic number.

It is not a de Polignac number, because 981009541 - 2⁵ = 981009509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 981009541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981009581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457776 + ... + 459913.

It is an arithmetic number, because the mean of its divisors is an integer number (245482075).

Almost surely, 2^981009541 is an apocalyptic number.

It is an amenable number.

981009541 is a deficient number, since it is larger than the sum of its proper divisors (918759).

981009541 is a wasteful number, since it uses less digits than its factorization.

981009541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918758.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 981009541 is about 31321.0718367044. The cubic root of 981009541 is about 993.6293479776.

The spelling of 981009541 in words is "nine hundred eighty-one million, nine thousand, five hundred forty-one".