1331138 has 4 divisors (see below), whose sum is σ = 1996710. Its totient is φ = 665568.

The previous prime is 1331123. The next prime is 1331153. The reversal of 1331138 is 8311331.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1331123) and next prime (1331153).

It can be written as a sum of positive squares in only one way, i.e., 1270129 + 61009 = 1127^2 + 247^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332783 + ... + 332786.

2^1331138 is an apocalyptic number.

1331138 is a deficient number, since it is larger than the sum of its proper divisors (665572).

1331138 is an equidigital number, since it uses as much as digits as its factorization.

1331138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665571.

The product of its digits is 216, while the sum is 20.

The square root of 1331138 is about 1153.7495395449. The cubic root of 1331138 is about 110.0038015215.

Adding to 1331138 its reverse (8311331), we get a palindrome (9642469).

The spelling of 1331138 in words is "one million, three hundred thirty-one thousand, one hundred thirty-eight".