1215706641 has 8 divisors (see below), whose sum is σ = 1621988160. Its totient is φ = 809948112.

The previous prime is 1215706579. The next prime is 1215706691. The reversal of 1215706641 is 1466075121.

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

It is not a de Polignac number, because 1215706641 - 2¹⁴ = 1215690257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215706691) 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, 125290 + ... + 134643.

It is an arithmetic number, because the mean of its divisors is an integer number (202748520).

Almost surely, 2^1215706641 is an apocalyptic number.

It is an amenable number.

1215706641 is a deficient number, since it is larger than the sum of its proper divisors (406281519).

1215706641 is a wasteful number, since it uses less digits than its factorization.

1215706641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261495.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 1215706641 is about 34866.9849714597. The cubic root of 1215706641 is about 1067.2748192917.

The spelling of 1215706641 in words is "one billion, two hundred fifteen million, seven hundred six thousand, six hundred forty-one".