1031391 has 6 divisors (see below), whose sum is σ = 1489800. Its totient is φ = 687588.

The previous prime is 1031357. The next prime is 1031399. The reversal of 1031391 is 1931301.

It is not a de Polignac number, because 1031391 - 2¹³ = 1023199 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57291 + ... + 57308.

It is an arithmetic number, because the mean of its divisors is an integer number (248300).

2^1031391 is an apocalyptic number.

1031391 is a deficient number, since it is larger than the sum of its proper divisors (458409).

1031391 is a wasteful number, since it uses less digits than its factorization.

1031391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114605 (or 114602 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 18.

The square root of 1031391 is about 1015.5742218075. The cubic root of 1031391 is about 101.0356048701.

Adding to 1031391 its reverse (1931301), we get a palindrome (2962692).

It can be divided in two parts, 10313 and 91, that added together give a square (10404 = 102²).

The spelling of 1031391 in words is "one million, thirty-one thousand, three hundred ninety-one".