1020181 has 4 divisors (see below), whose sum is σ = 1026252. Its totient is φ = 1014112.

The previous prime is 1020163. The next prime is 1020223. The reversal of 1020181 is 1810201.

1020181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1810201 = 149 ⋅12149.

It can be written as a sum of positive squares in 2 ways, for example, as 933156 + 87025 = 966^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020181 - 2¹⁹ = 495893 is a prime.

It is a super-2 number, since 2×1020181² = 2081538545522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020101) 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, 2776 + ... + 3121.

It is an arithmetic number, because the mean of its divisors is an integer number (256563).

2^1020181 is an apocalyptic number.

It is an amenable number.

1020181 is a deficient number, since it is larger than the sum of its proper divisors (6071).

1020181 is an equidigital number, since it uses as much as digits as its factorization.

1020181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6070.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1020181 is about 1010.0400982139. The cubic root of 1020181 is about 100.6682248101.

Adding to 1020181 its reverse (1810201), we get a palindrome (2830382).

It can be divided in two parts, 10201 and 81, that multiplied together give a square (826281 = 909²).

The spelling of 1020181 in words is "one million, twenty thousand, one hundred eighty-one".