1161021 has 4 divisors (see below), whose sum is σ = 1548032. Its totient is φ = 774012.

The previous prime is 1161011. The next prime is 1161031. The reversal of 1161021 is 1201611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1161011) and next prime (1161031).

It is not a de Polignac number, because 1161021 - 2⁵ = 1160989 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1160988 and 1161006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161001) 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, 193501 + ... + 193506.

It is an arithmetic number, because the mean of its divisors is an integer number (387008).

2^1161021 is an apocalyptic number.

It is an amenable number.

1161021 is a deficient number, since it is larger than the sum of its proper divisors (387011).

1161021 is an equidigital number, since it uses as much as digits as its factorization.

1161021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387010.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1161021 is about 1077.5068445258. The cubic root of 1161021 is about 105.1025754974.

Adding to 1161021 its reverse (1201611), we get a palindrome (2362632).

The spelling of 1161021 in words is "one million, one hundred sixty-one thousand, twenty-one".