381161 has 4 divisors (see below), whose sum is σ = 415824. Its totient is φ = 346500.

The previous prime is 381103. The next prime is 381167. The reversal of 381161 is 161183.

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: 161183 = 11 ⋅14653.

It is not a de Polignac number, because 381161 - 2⁶ = 381097 is a prime.

It is a house number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381167) 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, 17315 + ... + 17336.

It is an arithmetic number, because the mean of its divisors is an integer number (103956).

2³⁸¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

381161 is a deficient number, since it is larger than the sum of its proper divisors (34663).

381161 is a wasteful number, since it uses less digits than its factorization.

381161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34662.

The product of its digits is 144, while the sum is 20.

The square root of 381161 is about 617.3823774615. The cubic root of 381161 is about 72.5052552671.

The spelling of 381161 in words is "three hundred eighty-one thousand, one hundred sixty-one".