1231975 has 6 divisors (see below), whose sum is σ = 1527680. Its totient is φ = 985560.

The previous prime is 1231961. The next prime is 1231981. The reversal of 1231975 is 5791321.

It is not a de Polignac number, because 1231975 - 2⁵ = 1231943 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 24615 + ... + 24664.

2^1231975 is an apocalyptic number.

1231975 is a deficient number, since it is larger than the sum of its proper divisors (295705).

1231975 is an equidigital number, since it uses as much as digits as its factorization.

1231975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49289 (or 49284 counting only the distinct ones).

The product of its digits is 1890, while the sum is 28.

The square root of 1231975 is about 1109.9436922655. The cubic root of 1231975 is about 107.2014430915.

The spelling of 1231975 in words is "one million, two hundred thirty-one thousand, nine hundred seventy-five".