381031 has 8 divisors (see below), whose sum is σ = 450720. Its totient is φ = 315168.

The previous prime is 381019. The next prime is 381037. The reversal of 381031 is 130183.

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

It is not a de Polignac number, because 381031 - 2¹³ = 372839 is a prime.

It is a super-2 number, since 2×381031² = 290369245922, which contains 22 as substring.

It is a Duffinian number.

381031 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 380996 and 381014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381037) 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, 736 + ... + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (56340).

2³⁸¹⁰³¹ is an apocalyptic number.

381031 is a deficient number, since it is larger than the sum of its proper divisors (69689).

381031 is a wasteful number, since it uses less digits than its factorization.

381031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 381031 is about 617.2770852705. The cubic root of 381031 is about 72.4970113711.

The spelling of 381031 in words is "three hundred eighty-one thousand, thirty-one".