1221523 has 2 divisors, whose sum is σ = 1221524. Its totient is φ = 1221522.

The previous prime is 1221503. The next prime is 1221527. The reversal of 1221523 is 3251221.

It is a strong prime.

It is an emirp because it is prime and its reverse (3251221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221497 and 1221506.

It is not a weakly prime, because it can be changed into another prime (1221527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610761 + 610762.

It is an arithmetic number, because the mean of its divisors is an integer number (610762).

2^1221523 is an apocalyptic number.

1221523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221523 is an equidigital number, since it uses as much as digits as its factorization.

1221523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 16.

The square root of 1221523 is about 1105.2253163948. The cubic root of 1221523 is about 106.8974182080.

Adding to 1221523 its reverse (3251221), we get a palindrome (4472744).

The spelling of 1221523 in words is "one million, two hundred twenty-one thousand, five hundred twenty-three".