1231959 has 8 divisors (see below), whose sum is σ = 1653120. Its totient is φ = 816056.

The previous prime is 1231943. The next prime is 1231961. The reversal of 1231959 is 9591321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231959 - 2⁴ = 1231943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729 + ... + 1730.

It is an arithmetic number, because the mean of its divisors is an integer number (206640).

2^1231959 is an apocalyptic number.

1231959 is a deficient number, since it is larger than the sum of its proper divisors (421161).

1231959 is a wasteful number, since it uses less digits than its factorization.

1231959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2629.

The product of its digits is 2430, while the sum is 30.

The square root of 1231959 is about 1109.9364846693. The cubic root of 1231959 is about 107.2009790046.

The spelling of 1231959 in words is "one million, two hundred thirty-one thousand, nine hundred fifty-nine".