381131 has 4 divisors (see below), whose sum is σ = 382872. Its totient is φ = 379392.

The previous prime is 381103. The next prime is 381167. The reversal of 381131 is 131183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131183 = 13 ⋅10091.

It is a cyclic number.

It is not a de Polignac number, because 381131 - 2¹⁴ = 364747 is a prime.

It is a super-2 number, since 2×381131² = 290521678322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381181) 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, 485 + ... + 998.

It is an arithmetic number, because the mean of its divisors is an integer number (95718).

2³⁸¹¹³¹ is an apocalyptic number.

381131 is a deficient number, since it is larger than the sum of its proper divisors (1741).

381131 is a wasteful number, since it uses less digits than its factorization.

381131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740.

The product of its digits is 72, while the sum is 17.

The square root of 381131 is about 617.3580808575. The cubic root of 381131 is about 72.5033529959.

It can be divided in two parts, 381 and 131, that added together give a 9-th power (512 = 2⁹).

The spelling of 381131 in words is "three hundred eighty-one thousand, one hundred thirty-one".