1223731 has 2 divisors, whose sum is σ = 1223732. Its totient is φ = 1223730.

The previous prime is 1223723. The next prime is 1223749. The reversal of 1223731 is 1373221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1223731 - 2³ = 1223723 is a prime.

It is a super-2 number, since 2×1223731² = 2995035120722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1223699 and 1223708.

It is not a weakly prime, because it can be changed into another prime (1223231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611865 + 611866.

It is an arithmetic number, because the mean of its divisors is an integer number (611866).

2^1223731 is an apocalyptic number.

1223731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223731 is an equidigital number, since it uses as much as digits as its factorization.

1223731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 19.

The square root of 1223731 is about 1106.2237567509. The cubic root of 1223731 is about 106.9617879682.

Adding to 1223731 its reverse (1373221), we get a palindrome (2596952).

The spelling of 1223731 in words is "one million, two hundred twenty-three thousand, seven hundred thirty-one".