1153381 has 4 divisors (see below), whose sum is σ = 1203552. Its totient is φ = 1103212.

The previous prime is 1153367. The next prime is 1153393. The reversal of 1153381 is 1833511.

1153381 = T₅₄ + T₅₅ + ... + T₁₉₁.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1833511 = 79 ⋅23209.

It is a cyclic number.

It is not a de Polignac number, because 1153381 - 2⁵ = 1153349 is a prime.

It is a super-2 number, since 2×1153381² = 2660575462322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1153681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25051 + ... + 25096.

It is an arithmetic number, because the mean of its divisors is an integer number (300888).

2^1153381 is an apocalyptic number.

It is an amenable number.

1153381 is a deficient number, since it is larger than the sum of its proper divisors (50171).

1153381 is an equidigital number, since it uses as much as digits as its factorization.

1153381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50170.

The product of its digits is 360, while the sum is 22.

The square root of 1153381 is about 1073.9557719012. The cubic root of 1153381 is about 104.8715284373.

Adding to 1153381 its reverse (1833511), we get a palindrome (2986892).

The spelling of 1153381 in words is "one million, one hundred fifty-three thousand, three hundred eighty-one".