1231671 has 16 divisors (see below), whose sum is σ = 1900800. Its totient is φ = 694848.

The previous prime is 1231669. The next prime is 1231687. The reversal of 1231671 is 1761321.

It is not a de Polignac number, because 1231671 - 2¹ = 1231669 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

1231671 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1540 + ... + 2198.

It is an arithmetic number, because the mean of its divisors is an integer number (118800).

2^1231671 is an apocalyptic number.

1231671 is a deficient number, since it is larger than the sum of its proper divisors (669129).

1231671 is an equidigital number, since it uses as much as digits as its factorization.

1231671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758.

The product of its digits is 252, while the sum is 21.

The square root of 1231671 is about 1109.8067399327. The cubic root of 1231671 is about 107.1926247525.

Adding to 1231671 its reverse (1761321), we get a palindrome (2992992).

The spelling of 1231671 in words is "one million, two hundred thirty-one thousand, six hundred seventy-one".