1231567 has 4 divisors (see below), whose sum is σ = 1236960. Its totient is φ = 1226176.

The previous prime is 1231553. The next prime is 1231577. The reversal of 1231567 is 7651321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7651321 = 151 ⋅50671.

It is a cyclic number.

It is not a de Polignac number, because 1231567 - 2¹¹ = 1229519 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2338 + ... + 2815.

It is an arithmetic number, because the mean of its divisors is an integer number (309240).

2^1231567 is an apocalyptic number.

1231567 is a deficient number, since it is larger than the sum of its proper divisors (5393).

1231567 is an equidigital number, since it uses as much as digits as its factorization.

1231567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5392.

The product of its digits is 1260, while the sum is 25.

The square root of 1231567 is about 1109.7598839389. The cubic root of 1231567 is about 107.1896076192.

Adding to 1231567 its reverse (7651321), we get a palindrome (8882888).

The spelling of 1231567 in words is "one million, two hundred thirty-one thousand, five hundred sixty-seven".