1221527 has 2 divisors, whose sum is σ = 1221528. Its totient is φ = 1221526.

The previous prime is 1221523. The next prime is 1221533. The reversal of 1221527 is 7251221.

It is a weak prime.

It is an emirp because it is prime and its reverse (7251221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221527 - 2² = 1221523 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1221499 and 1221508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610763 + 610764.

It is an arithmetic number, because the mean of its divisors is an integer number (610764).

2^1221527 is an apocalyptic number.

1221527 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221527 is an equidigital number, since it uses as much as digits as its factorization.

1221527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 280, while the sum is 20.

The square root of 1221527 is about 1105.2271259791. The cubic root of 1221527 is about 106.8975348899.

Adding to 1221527 its reverse (7251221), we get a palindrome (8472748).

The spelling of 1221527 in words is "one million, two hundred twenty-one thousand, five hundred twenty-seven".