1215909941 has 8 divisors (see below), whose sum is σ = 1281572280. Its totient is φ = 1151829952.

The previous prime is 1215909907. The next prime is 1215909971. The reversal of 1215909941 is 1499095121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 434931025 + 780978916 = 20855^2 + 27946^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1215909941 - 2¹⁴ = 1215893557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215909971) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 394010 + ... + 397083.

It is an arithmetic number, because the mean of its divisors is an integer number (160196535).

Almost surely, 2^1215909941 is an apocalyptic number.

It is an amenable number.

1215909941 is a deficient number, since it is larger than the sum of its proper divisors (65662339).

1215909941 is an equidigital number, since it uses as much as digits as its factorization.

1215909941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791175.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 1215909941 is about 34869.9002149418. The cubic root of 1215909941 is about 1067.3343086645.

The spelling of 1215909941 in words is "one billion, two hundred fifteen million, nine hundred nine thousand, nine hundred forty-one".