1231329 has 8 divisors (see below), whose sum is σ = 1791072. Its totient is φ = 746240.

The previous prime is 1231319. The next prime is 1231337. The reversal of 1231329 is 9231321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231329 - 2⁴ = 1231313 is a prime.

It is a super-2 number, since 2×1231329² = 3032342212482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231309) 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, 18624 + ... + 18689.

It is an arithmetic number, because the mean of its divisors is an integer number (223884).

2^1231329 is an apocalyptic number.

It is an amenable number.

1231329 is a deficient number, since it is larger than the sum of its proper divisors (559743).

1231329 is a wasteful number, since it uses less digits than its factorization.

1231329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37327.

The product of its digits is 324, while the sum is 21.

The square root of 1231329 is about 1109.6526483544. The cubic root of 1231329 is about 107.1827023865.

The spelling of 1231329 in words is "one million, two hundred thirty-one thousand, three hundred twenty-nine".