1212521 has 2 divisors, whose sum is σ = 1212522. Its totient is φ = 1212520.

The previous prime is 1212517. The next prime is 1212551. The reversal of 1212521 is 1252121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000000 + 212521 = 1000^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212521 - 2² = 1212517 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212496 and 1212505.

It is not a weakly prime, because it can be changed into another prime (1212551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606260 + 606261.

It is an arithmetic number, because the mean of its divisors is an integer number (606261).

2^1212521 is an apocalyptic number.

It is an amenable number.

1212521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212521 is an equidigital number, since it uses as much as digits as its factorization.

1212521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40, while the sum is 14.

The square root of 1212521 is about 1101.1453128448. The cubic root of 1212521 is about 106.6341773882.

Adding to 1212521 its reverse (1252121), we get a palindrome (2464642).

The spelling of 1212521 in words is "one million, two hundred twelve thousand, five hundred twenty-one".