1161381 has 16 divisors (see below), whose sum is σ = 1690304. Its totient is φ = 705024.

The previous prime is 1161371. The next prime is 1161397. The reversal of 1161381 is 1831611.

It is not a de Polignac number, because 1161381 - 2⁶ = 1161317 is a prime.

It is a super-2 number, since 2×1161381² = 2697611654322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3630 + ... + 3936.

It is an arithmetic number, because the mean of its divisors is an integer number (105644).

2^1161381 is an apocalyptic number.

It is an amenable number.

1161381 is a deficient number, since it is larger than the sum of its proper divisors (528923).

1161381 is a wasteful number, since it uses less digits than its factorization.

1161381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420.

The product of its digits is 144, while the sum is 21.

The square root of 1161381 is about 1077.6738838814. The cubic root of 1161381 is about 105.1134374936.

Adding to 1161381 its reverse (1831611), we get a palindrome (2992992).

The spelling of 1161381 in words is "one million, one hundred sixty-one thousand, three hundred eighty-one".