1215561067 has 16 divisors (see below), whose sum is σ = 1401400000. Its totient is φ = 1032808320.

The previous prime is 1215561059. The next prime is 1215561079. The reversal of 1215561067 is 7601655121.

It is a cyclic number.

It is not a de Polignac number, because 1215561067 - 2³ = 1215561059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215561007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440809 + ... + 443557.

It is an arithmetic number, because the mean of its divisors is an integer number (87587500).

Almost surely, 2^1215561067 is an apocalyptic number.

1215561067 is a deficient number, since it is larger than the sum of its proper divisors (185838933).

1215561067 is a wasteful number, since it uses less digits than its factorization.

1215561067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3286.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 1215561067 is about 34864.8973467584. The cubic root of 1215561067 is about 1067.2322175485.

The spelling of 1215561067 in words is "one billion, two hundred fifteen million, five hundred sixty-one thousand, sixty-seven".