2151565601 has 2 divisors, whose sum is σ = 2151565602. Its totient is φ = 2151565600.

The previous prime is 2151565589. The next prime is 2151565627. The reversal of 2151565601 is 1065651512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2013855376 + 137710225 = 44876^2 + 11735^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151565601 - 2³⁰ = 1077823777 is a prime.

It is not a weakly prime, because it can be changed into another prime (2151565631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075782800 + 1075782801.

It is an arithmetic number, because the mean of its divisors is an integer number (1075782801).

Almost surely, 2^2151565601 is an apocalyptic number.

It is an amenable number.

2151565601 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151565601 is an equidigital number, since it uses as much as digits as its factorization.

2151565601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 2151565601 is about 46384.9717149854. The cubic root of 2151565601 is about 1290.9760857627.

The spelling of 2151565601 in words is "two billion, one hundred fifty-one million, five hundred sixty-five thousand, six hundred one".