1231647 has 8 divisors (see below), whose sum is σ = 1647360. Its totient is φ = 818520.

The previous prime is 1231631. The next prime is 1231663. The reversal of 1231647 is 7461321.

It is an interprime number because it is at equal distance from previous prime (1231631) and next prime (1231663).

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

It is not a de Polignac number, because 1231647 - 2⁴ = 1231631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231687) 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, 1354 + ... + 2072.

It is an arithmetic number, because the mean of its divisors is an integer number (205920).

2^1231647 is an apocalyptic number.

1231647 is a deficient number, since it is larger than the sum of its proper divisors (415713).

1231647 is an equidigital number, since it uses as much as digits as its factorization.

1231647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293.

The product of its digits is 1008, while the sum is 24.

The square root of 1231647 is about 1109.7959271866. The cubic root of 1231647 is about 107.1919285060.

Adding to 1231647 its reverse (7461321), we get a palindrome (8692968).

It can be divided in two parts, 123 and 1647, that added together give a triangular number (1770 = T₅₉).

The spelling of 1231647 in words is "one million, two hundred thirty-one thousand, six hundred forty-seven".