1231801 has 4 divisors (see below), whose sum is σ = 1236852. Its totient is φ = 1226752.

The previous prime is 1231799. The next prime is 1231807. The reversal of 1231801 is 1081321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1081321 = 43 ⋅25147.

It can be written as a sum of positive squares in 2 ways, for example, as 1155625 + 76176 = 1075^2 + 276^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231801 - 2¹ = 1231799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231807) 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, 2140 + ... + 2653.

It is an arithmetic number, because the mean of its divisors is an integer number (309213).

2^1231801 is an apocalyptic number.

It is an amenable number.

1231801 is a deficient number, since it is larger than the sum of its proper divisors (5051).

1231801 is an equidigital number, since it uses as much as digits as its factorization.

1231801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5050.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1231801 is about 1109.8653071432. The cubic root of 1231801 is about 107.1963959303.

It can be divided in two parts, 12 and 31801, that added together give a palindrome (31813).

The spelling of 1231801 in words is "one million, two hundred thirty-one thousand, eight hundred one".