2051265145 has 4 divisors (see below), whose sum is σ = 2461518180. Its totient is φ = 1641012112.

The previous prime is 2051265127. The next prime is 2051265173. The reversal of 2051265145 is 5415621502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1068505344 + 982759801 = 32688^2 + 31349^2 .

It is a cyclic number.

It is not a de Polignac number, because 2051265145 - 2⁵ = 2051265113 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205126510 + ... + 205126519.

It is an arithmetic number, because the mean of its divisors is an integer number (615379545).

Almost surely, 2^2051265145 is an apocalyptic number.

It is an amenable number.

2051265145 is a deficient number, since it is larger than the sum of its proper divisors (410253035).

2051265145 is an equidigital number, since it uses as much as digits as its factorization.

2051265145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410253034.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 2051265145 is about 45290.8947250990. The cubic root of 2051265145 is about 1270.5953653454.

Adding to 2051265145 its reverse (5415621502), we get a palindrome (7466886647).

The spelling of 2051265145 in words is "two billion, fifty-one million, two hundred sixty-five thousand, one hundred forty-five".