1223491 has 2 divisors, whose sum is σ = 1223492. Its totient is φ = 1223490.

The previous prime is 1223489. The next prime is 1223527. The reversal of 1223491 is 1943221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1223491 - 2¹ = 1223489 is a prime.

Together with 1223489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1223471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611745 + 611746.

It is an arithmetic number, because the mean of its divisors is an integer number (611746).

2^1223491 is an apocalyptic number.

1223491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223491 is an equidigital number, since it uses as much as digits as its factorization.

1223491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 1223491 is about 1106.1152742820. The cubic root of 1223491 is about 106.9547950078.

The spelling of 1223491 in words is "one million, two hundred twenty-three thousand, four hundred ninety-one".