1215941775 has 12 divisors (see below), whose sum is σ = 2010357192. Its totient is φ = 648502240.

The previous prime is 1215941773. The next prime is 1215941777. The reversal of 1215941775 is 5771495121.

It is an interprime number because it is at equal distance from previous prime (1215941773) and next prime (1215941777).

It is not a de Polignac number, because 1215941775 - 2¹ = 1215941773 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215941773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8106204 + ... + 8106353.

It is an arithmetic number, because the mean of its divisors is an integer number (167529766).

Almost surely, 2^1215941775 is an apocalyptic number.

1215941775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1215941775 is a deficient number, since it is larger than the sum of its proper divisors (794415417).

1215941775 is a wasteful number, since it uses less digits than its factorization.

1215941775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16212570 (or 16212565 counting only the distinct ones).

The product of its digits is 88200, while the sum is 42.

The square root of 1215941775 is about 34870.3566801374. The cubic root of 1215941775 is about 1067.3436232864.

The spelling of 1215941775 in words is "one billion, two hundred fifteen million, nine hundred forty-one thousand, seven hundred seventy-five".