1215197 has 2 divisors, whose sum is σ = 1215198. Its totient is φ = 1215196.

The previous prime is 1215173. The next prime is 1215209. The reversal of 1215197 is 7915121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1207801 + 7396 = 1099^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215197 - 2⁶ = 1215133 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215157) 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, 607598 + 607599.

It is an arithmetic number, because the mean of its divisors is an integer number (607599).

2^1215197 is an apocalyptic number.

It is an amenable number.

1215197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215197 is an equidigital number, since it uses as much as digits as its factorization.

1215197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630, while the sum is 26.

The square root of 1215197 is about 1102.3597416452. The cubic root of 1215197 is about 106.7125659669.

The spelling of 1215197 in words is "one million, two hundred fifteen thousand, one hundred ninety-seven".