1000538181 has 6 divisors (see below), whose sum is σ = 1445221830. Its totient is φ = 667025448.

The previous prime is 1000538171. The next prime is 1000538243. The reversal of 1000538181 is 1818350001.

It can be written as a sum of positive squares in only one way, i.e., 982822500 + 17715681 = 31350^2 + 4209^2 .

It is not a de Polignac number, because 1000538181 - 2⁶ = 1000538117 is a prime.

It is a super-2 number, since 2×1000538181² = 2002153303277577522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000538101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55585446 + ... + 55585463.

It is an arithmetic number, because the mean of its divisors is an integer number (240870305).

Almost surely, 2^1000538181 is an apocalyptic number.

It is an amenable number.

1000538181 is a deficient number, since it is larger than the sum of its proper divisors (444683649).

1000538181 is a wasteful number, since it uses less digits than its factorization.

1000538181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111170915 (or 111170912 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 1000538181 is about 31631.2848458611. The cubic root of 1000538181 is about 1000.1793614942.

Adding to 1000538181 its reverse (1818350001), we get a palindrome (2818888182).

The spelling of 1000538181 in words is "one billion, five hundred thirty-eight thousand, one hundred eighty-one".