1171215 has 24 divisors (see below), whose sum is σ = 2150928. Its totient is φ = 587520.

The previous prime is 1171207. The next prime is 1171231. The reversal of 1171215 is 5121711.

It is a happy number.

1171215 is a nontrivial binomial coefficient, being equal to C(1531, 2).

It is not a de Polignac number, because 1171215 - 2³ = 1171207 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1 + ... + 1530.

It is an arithmetic number, because the mean of its divisors is an integer number (89622).

2^1171215 is an apocalyptic number.

1171215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1171215 is the 1530-th triangular number.

1171215 is a deficient number, since it is larger than the sum of its proper divisors (979713).

1171215 is a wasteful number, since it uses less digits than its factorization.

1171215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559 (or 1556 counting only the distinct ones).

The product of its digits is 70, while the sum is 18.

The square root of 1171215 is about 1082.2268708547. The cubic root of 1171215 is about 105.4092868926.

Adding to 1171215 its reverse (5121711), we get a palindrome (6292926).

The spelling of 1171215 in words is "one million, one hundred seventy-one thousand, two hundred fifteen".