1215121 has 2 divisors, whose sum is σ = 1215122. Its totient is φ = 1215120.

The previous prime is 1215103. The next prime is 1215133.

1215121 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 923521 + 291600 = 961^2 + 540^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1215121 - 2¹⁵ = 1182353 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607560 + 607561.

It is an arithmetic number, because the mean of its divisors is an integer number (607561).

2^1215121 is an apocalyptic number.

It is an amenable number.

1215121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215121 is an equidigital number, since it uses as much as digits as its factorization.

1215121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20, while the sum is 13.

The square root of 1215121 is about 1102.3252696006. The cubic root of 1215121 is about 106.7103412730.

The spelling of 1215121 in words is "one million, two hundred fifteen thousand, one hundred twenty-one".