1231215 has 16 divisors (see below), whose sum is σ = 1996800. Its totient is φ = 647712.

The previous prime is 1231207. The next prime is 1231229. The reversal of 1231215 is 5121321.

It is not a de Polignac number, because 1231215 - 2³ = 1231207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

1231215 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1231194 and 1231203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666 + ... + 1704.

It is an arithmetic number, because the mean of its divisors is an integer number (124800).

2^1231215 is an apocalyptic number.

1231215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1231215 is a deficient number, since it is larger than the sum of its proper divisors (765585).

1231215 is a wasteful number, since it uses less digits than its factorization.

1231215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126.

The product of its digits is 60, while the sum is 15.

The square root of 1231215 is about 1109.6012797397. The cubic root of 1231215 is about 107.1793945229.

Adding to 1231215 its reverse (5121321), we get a palindrome (6352536).

The spelling of 1231215 in words is "one million, two hundred thirty-one thousand, two hundred fifteen".