2151265549 has 2 divisors, whose sum is σ = 2151265550. Its totient is φ = 2151265548.

The previous prime is 2151265541. The next prime is 2151265579. The reversal of 2151265549 is 9455621512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1361093449 + 790172100 = 36893^2 + 28110^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151265549 - 2³ = 2151265541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151265541) 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 as a sum of consecutive naturals, namely, 1075632774 + 1075632775.

It is an arithmetic number, because the mean of its divisors is an integer number (1075632775).

Almost surely, 2^2151265549 is an apocalyptic number.

It is an amenable number.

2151265549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151265549 is an equidigital number, since it uses as much as digits as its factorization.

2151265549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 40.

The square root of 2151265549 is about 46381.7372356836. The cubic root of 2151265549 is about 1290.9160708655.

The spelling of 2151265549 in words is "two billion, one hundred fifty-one million, two hundred sixty-five thousand, five hundred forty-nine".