1131021 has 6 divisors (see below), whose sum is σ = 1633710. Its totient is φ = 754008.

The previous prime is 1130981. The next prime is 1131023. The reversal of 1131021 is 1201311.

It can be written as a sum of positive squares in only one way, i.e., 1022121 + 108900 = 1011^2 + 330^2 .

It is not a de Polignac number, because 1131021 - 2⁶ = 1130957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 125669 = 1131021 / (1 + 1 + 3 + 1 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 1130994 and 1131012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62826 + ... + 62843.

It is an arithmetic number, because the mean of its divisors is an integer number (272285).

2^1131021 is an apocalyptic number.

It is an amenable number.

1131021 is a deficient number, since it is larger than the sum of its proper divisors (502689).

1131021 is a wasteful number, since it uses less digits than its factorization.

1131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125675 (or 125672 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1131021 is about 1063.4947108472. The cubic root of 1131021 is about 104.1894046008.

Adding to 1131021 its reverse (1201311), we get a palindrome (2332332).

The spelling of 1131021 in words is "one million, one hundred thirty-one thousand, twenty-one".