1215161 has 2 divisors, whose sum is σ = 1215162. Its totient is φ = 1215160.

The previous prime is 1215157. The next prime is 1215167. The reversal of 1215161 is 1615121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155625 + 59536 = 1075^2 + 244^2 .

It is an emirp because it is prime and its reverse (1615121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1215161 - 2² = 1215157 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1215167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607580 + 607581.

It is an arithmetic number, because the mean of its divisors is an integer number (607581).

2^1215161 is an apocalyptic number.

It is an amenable number.

1215161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215161 is an equidigital number, since it uses as much as digits as its factorization.

1215161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60, while the sum is 17.

The square root of 1215161 is about 1102.3434129163. The cubic root of 1215161 is about 106.7115121761.

The spelling of 1215161 in words is "one million, two hundred fifteen thousand, one hundred sixty-one".