1156121 has 2 divisors, whose sum is σ = 1156122. Its totient is φ = 1156120.

The previous prime is 1156109. The next prime is 1156151. The reversal of 1156121 is 1216511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1132096 + 24025 = 1064^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156121 - 2¹⁰ = 1155097 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1156121.

It is not a weakly prime, because it can be changed into another prime (1156151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578060 + 578061.

It is an arithmetic number, because the mean of its divisors is an integer number (578061).

2^1156121 is an apocalyptic number.

It is an amenable number.

1156121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156121 is an equidigital number, since it uses as much as digits as its factorization.

1156121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60, while the sum is 17.

The square root of 1156121 is about 1075.2306729256. The cubic root of 1156121 is about 104.9545078818.

It can be divided in two parts, 1156 and 121, that multiplied together give a square (139876 = 374²).

The spelling of 1156121 in words is "one million, one hundred fifty-six thousand, one hundred twenty-one".