2125512251 has 4 divisors (see below), whose sum is σ = 2126130552. Its totient is φ = 2124893952.

The previous prime is 2125512239. The next prime is 2125512269. The reversal of 2125512251 is 1522155212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2125512251 - 2⁶ = 2125512187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2125512251.

It is not an unprimeable number, because it can be changed into a prime (2125512211) 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, 303965 + ... + 310878.

It is an arithmetic number, because the mean of its divisors is an integer number (531532638).

Almost surely, 2^2125512251 is an apocalyptic number.

2125512251 is a deficient number, since it is larger than the sum of its proper divisors (618301).

2125512251 is an equidigital number, since it uses as much as digits as its factorization.

2125512251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618300.

The product of its digits is 2000, while the sum is 26.

The square root of 2125512251 is about 46103.2780938623. The cubic root of 2125512251 is about 1285.7440922502.

Adding to 2125512251 its reverse (1522155212), we get a palindrome (3647667463).

The spelling of 2125512251 in words is "two billion, one hundred twenty-five million, five hundred twelve thousand, two hundred fifty-one".