1291031 has 16 divisors (see below), whose sum is σ = 1647360. Its totient is φ = 984960.

The previous prime is 1291021. The next prime is 1291063. The reversal of 1291031 is 1301921.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1291031 is a prime.

It is a super-2 number, since 2×1291031² = 3333522085922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1976 + ... + 2546.

It is an arithmetic number, because the mean of its divisors is an integer number (102960).

2^1291031 is an apocalyptic number.

1291031 is a deficient number, since it is larger than the sum of its proper divisors (356329).

1291031 is a wasteful number, since it uses less digits than its factorization.

1291031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1291031 is about 1136.2354509520. The cubic root of 1291031 is about 108.8877164867.

Adding to 1291031 its reverse (1301921), we get a palindrome (2592952).

The spelling of 1291031 in words is "one million, two hundred ninety-one thousand, thirty-one".