1611261 has 6 divisors (see below), whose sum is σ = 2327390. Its totient is φ = 1074168.

The previous prime is 1611251. The next prime is 1611289. The reversal of 1611261 is 1621161.

It can be written as a sum of positive squares in only one way, i.e., 1610361 + 900 = 1269^2 + 30^2 .

It is not a de Polignac number, because 1611261 - 2¹⁰ = 1610237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1611241) 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 5 ways as a sum of consecutive naturals, for example, 89506 + ... + 89523.

2^1611261 is an apocalyptic number.

It is an amenable number.

1611261 is a deficient number, since it is larger than the sum of its proper divisors (716129).

1611261 is a wasteful number, since it uses less digits than its factorization.

1611261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179035 (or 179032 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1611261 is about 1269.3545603967. The cubic root of 1611261 is about 117.2344629904.

The spelling of 1611261 in words is "one million, six hundred eleven thousand, two hundred sixty-one".