1231505 has 8 divisors (see below), whose sum is σ = 1612224. Its totient is φ = 895600.

The previous prime is 1231487. The next prime is 1231511. The reversal of 1231505 is 5051321.

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

It is not a de Polignac number, because 1231505 - 2¹⁴ = 1215121 is a prime.

It is a super-3 number, since 3×1231505³ = 5603118314553337875, which contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11141 + ... + 11250.

It is an arithmetic number, because the mean of its divisors is an integer number (201528).

2^1231505 is an apocalyptic number.

It is an amenable number.

1231505 is a deficient number, since it is larger than the sum of its proper divisors (380719).

1231505 is a wasteful number, since it uses less digits than its factorization.

1231505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22407.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 1231505 is about 1109.7319496167. The cubic root of 1231505 is about 107.1878088628.

Adding to 1231505 its reverse (5051321), we get a palindrome (6282826).

The spelling of 1231505 in words is "one million, two hundred thirty-one thousand, five hundred five".