1289331 has 24 divisors (see below), whose sum is σ = 2061360. Its totient is φ = 793728.

The previous prime is 1289329. The next prime is 1289333. The reversal of 1289331 is 1339821.

It is an interprime number because it is at equal distance from previous prime (1289329) and next prime (1289333).

It is not a de Polignac number, because 1289331 - 2¹ = 1289329 is a prime.

It is a super-2 number, since 2×1289331² = 3324748855122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1289295 and 1289304.

It is not an unprimeable number, because it can be changed into a prime (1289333) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24301 + ... + 24353.

It is an arithmetic number, because the mean of its divisors is an integer number (85890).

2^1289331 is an apocalyptic number.

1289331 is a deficient number, since it is larger than the sum of its proper divisors (772029).

1289331 is an equidigital number, since it uses as much as digits as its factorization.

1289331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 73 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 1289331 is about 1135.4871201383. The cubic root of 1289331 is about 108.8399018779.

The spelling of 1289331 in words is "one million, two hundred eighty-nine thousand, three hundred thirty-one".