It is a happy number.
It is a semiprime because it is the product of two primes.
It is a congruent number.
It is an unprimeable number.
21231502 is an apocalyptic number.
1231502 is an equidigital number, since it uses as much as digits as its factorization.
1231502 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 615753.
The square root of 1231502 is about 1109.7305979381. The cubic root of 1231502 is about 107.1877218246.
Adding to 1231502 its reverse (2051321), we get a palindrome (3282823).
The spelling of 1231502 in words is "one million, two hundred thirty-one thousand, five hundred two".