2156543515 has 32 divisors (see below), whose sum is σ = 3017088000. Its totient is φ = 1449161088.

The previous prime is 2156543513. The next prime is 2156543537. The reversal of 2156543515 is 5153456512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2156543515 - 2¹ = 2156543513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2156543513) 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 31 ways as a sum of consecutive naturals, for example, 739881 + ... + 742789.

It is an arithmetic number, because the mean of its divisors is an integer number (94284000).

Almost surely, 2^2156543515 is an apocalyptic number.

2156543515 is a deficient number, since it is larger than the sum of its proper divisors (860544485).

2156543515 is a wasteful number, since it uses less digits than its factorization.

2156543515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3339.

The product of its digits is 90000, while the sum is 37.

The square root of 2156543515 is about 46438.5994082509. The cubic root of 2156543515 is about 1291.9709300475.

The spelling of 2156543515 in words is "two billion, one hundred fifty-six million, five hundred forty-three thousand, five hundred fifteen".