1161005 has 8 divisors (see below), whose sum is σ = 1409400. Its totient is φ = 918016.

The previous prime is 1161001. The next prime is 1161007. The reversal of 1161005 is 5001611.

It can be written as a sum of positive squares in 4 ways, for example, as 24649 + 1136356 = 157^2 + 1066^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1161005 - 2² = 1161001 is a prime.

It is a super-2 number, since 2×1161005² = 2695865220050, which contains 22 as substring.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 860 + ... + 1749.

It is an arithmetic number, because the mean of its divisors is an integer number (176175).

2^1161005 is an apocalyptic number.

It is an amenable number.

1161005 is a deficient number, since it is larger than the sum of its proper divisors (248395).

1161005 is an equidigital number, since it uses as much as digits as its factorization.

1161005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2703.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 1161005 is about 1077.4994199534. The cubic root of 1161005 is about 105.1020926899.

Adding to 1161005 its reverse (5001611), we get a palindrome (6162616).

Subtracting 1161005 from its reverse (5001611), we obtain a triangular number (3840606 = T₂₇₇₁).

It can be divided in two parts, 11 and 61005, that added together give a palindrome (61016).

The spelling of 1161005 in words is "one million, one hundred sixty-one thousand, five".