2051503121 has 4 divisors (see below), whose sum is σ = 2051668452. Its totient is φ = 2051337792.

The previous prime is 2051503049. The next prime is 2051503127. The reversal of 2051503121 is 1213051502.

It is a happy number.

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 1111222225 + 940280896 = 33335^2 + 30664^2 .

It is a cyclic number.

It is not a de Polignac number, because 2051503121 - 2¹⁴ = 2051486737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2051503093 and 2051503102.

It is not an unprimeable number, because it can be changed into a prime (2051503127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62396 + ... + 89421.

It is an arithmetic number, because the mean of its divisors is an integer number (512917113).

Almost surely, 2^2051503121 is an apocalyptic number.

It is an amenable number.

2051503121 is a deficient number, since it is larger than the sum of its proper divisors (165331).

2051503121 is a wasteful number, since it uses less digits than its factorization.

2051503121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165330.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2051503121 is about 45293.5218436368. The cubic root of 2051503121 is about 1270.6444991708.

Adding to 2051503121 its reverse (1213051502), we get a palindrome (3264554623).

The spelling of 2051503121 in words is "two billion, fifty-one million, five hundred three thousand, one hundred twenty-one".