1291138 has 16 divisors (see below), whose sum is σ = 2031480. Its totient is φ = 614656.

The previous prime is 1291117. The next prime is 1291139. The reversal of 1291138 is 8311921.

It can be written as a sum of positive squares in 4 ways, for example, as 1108809 + 182329 = 1053^2 + 427^2 .

It is not an unprimeable number, because it can be changed into a prime (1291139) 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, 6456 + ... + 6652.

2^1291138 is an apocalyptic number.

1291138 is a deficient number, since it is larger than the sum of its proper divisors (740342).

1291138 is a wasteful number, since it uses less digits than its factorization.

1291138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341.

The product of its digits is 432, while the sum is 25.

The square root of 1291138 is about 1136.2825352878. The cubic root of 1291138 is about 108.8907245900.

The spelling of 1291138 in words is "one million, two hundred ninety-one thousand, one hundred thirty-eight".