1031381 has 4 divisors (see below), whose sum is σ = 1110732. Its totient is φ = 952032.

The previous prime is 1031357. The next prime is 1031399. The reversal of 1031381 is 1831301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1831301 = 59 ⋅31039.

It can be written as a sum of positive squares in 2 ways, for example, as 128881 + 902500 = 359^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031381 - 2¹⁰ = 1030357 is a prime.

It is a super-2 number, since 2×1031381² = 2127493534322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031081) 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, 39656 + ... + 39681.

It is an arithmetic number, because the mean of its divisors is an integer number (277683).

2^1031381 is an apocalyptic number.

It is an amenable number.

1031381 is a deficient number, since it is larger than the sum of its proper divisors (79351).

1031381 is an equidigital number, since it uses as much as digits as its factorization.

1031381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79350.

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

The square root of 1031381 is about 1015.5692984725. The cubic root of 1031381 is about 101.0352783340.

Adding to 1031381 its reverse (1831301), we get a palindrome (2862682).

The spelling of 1031381 in words is "one million, thirty-one thousand, three hundred eighty-one".