1231005 has 8 divisors (see below), whose sum is σ = 1969632. Its totient is φ = 656528.

The previous prime is 1231003. The next prime is 1231039. The reversal of 1231005 is 5001321.

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 1231005 - 2¹ = 1231003 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41019 + ... + 41048.

It is an arithmetic number, because the mean of its divisors is an integer number (246204).

2^1231005 is an apocalyptic number.

1231005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231005 is a deficient number, since it is larger than the sum of its proper divisors (738627).

1231005 is an equidigital number, since it uses as much as digits as its factorization.

1231005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82075.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 1231005 is about 1109.5066471184. The cubic root of 1231005 is about 107.1733005554.

Adding to 1231005 its reverse (5001321), we get a palindrome (6232326).

It can be divided in two parts, 123 and 1005, that added together give a triangular number (1128 = T₄₇).

The spelling of 1231005 in words is "one million, two hundred thirty-one thousand, five".