2025400081 has 2 divisors, whose sum is σ = 2025400082. Its totient is φ = 2025400080.

The previous prime is 2025400051. The next prime is 2025400087. The reversal of 2025400081 is 1800045202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2024190081 + 1210000 = 44991^2 + 1100^2 .

It is a cyclic number.

It is not a de Polignac number, because 2025400081 - 2¹¹ = 2025398033 is a prime.

It is a super-2 number, since 2×2025400081² = 8204490976229613122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2025400087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1012700040 + 1012700041.

It is an arithmetic number, because the mean of its divisors is an integer number (1012700041).

Almost surely, 2^2025400081 is an apocalyptic number.

It is an amenable number.

2025400081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2025400081 is an equidigital number, since it uses as much as digits as its factorization.

2025400081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 2025400081 is about 45004.4451248985. The cubic root of 2025400081 is about 1265.2323113264.

Adding to 2025400081 its reverse (1800045202), we get a palindrome (3825445283).

The spelling of 2025400081 in words is "two billion, twenty-five million, four hundred thousand, eighty-one".