2125241581 has 2 divisors, whose sum is σ = 2125241582. Its totient is φ = 2125241580.

The previous prime is 2125241543. The next prime is 2125241609. The reversal of 2125241581 is 1851425212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1440582025 + 684659556 = 37955^2 + 26166^2 .

It is a cyclic number.

It is not a de Polignac number, because 2125241581 - 2⁷ = 2125241453 is a prime.

It is a super-2 number, since 2×2125241581² = 9033303555222759122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2125241081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062620790 + 1062620791.

It is an arithmetic number, because the mean of its divisors is an integer number (1062620791).

Almost surely, 2^2125241581 is an apocalyptic number.

It is an amenable number.

2125241581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2125241581 is an equidigital number, since it uses as much as digits as its factorization.

2125241581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6400, while the sum is 31.

The square root of 2125241581 is about 46100.3425258425. The cubic root of 2125241581 is about 1285.6895129166.

Adding to 2125241581 its reverse (1851425212), we get a palindrome (3976666793).

The spelling of 2125241581 in words is "two billion, one hundred twenty-five million, two hundred forty-one thousand, five hundred eighty-one".