1161521 has 2 divisors, whose sum is σ = 1161522. Its totient is φ = 1161520.

The previous prime is 1161509. The next prime is 1161529. The reversal of 1161521 is 1251611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 874225 + 287296 = 935^2 + 536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1161521.

It is not a weakly prime, because it can be changed into another prime (1161529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580760 + 580761.

It is an arithmetic number, because the mean of its divisors is an integer number (580761).

2^1161521 is an apocalyptic number.

It is an amenable number.

1161521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161521 is an equidigital number, since it uses as much as digits as its factorization.

1161521 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 1161521 is about 1077.7388366390. The cubic root of 1161521 is about 105.1176609970.

The spelling of 1161521 in words is "one million, one hundred sixty-one thousand, five hundred twenty-one".