1031491 has 6 divisors (see below), whose sum is σ = 1090460. Its totient is φ = 973008.

The previous prime is 1031489. The next prime is 1031507. The reversal of 1031491 is 1941301.

It is a happy number.

It is not a de Polignac number, because 1031491 - 2¹ = 1031489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1031411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4311 + ... + 4543.

2^1031491 is an apocalyptic number.

1031491 is a deficient number, since it is larger than the sum of its proper divisors (58969).

1031491 is an frugal number, since it uses more digits than its factorization.

1031491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1031491 is about 1015.6234538450. The cubic root of 1031491 is about 101.0388701154.

Multiplying 1031491 by its sum of digits (19), we get a square (19598329 = 4427²).

1031491 divided by its sum of digits (19) gives a square (54289 = 233²).

Adding to 1031491 its reverse (1941301), we get a palindrome (2972792).

The spelling of 1031491 in words is "one million, thirty-one thousand, four hundred ninety-one".