25401881 has 2 divisors, whose sum is σ = 25401882. Its totient is φ = 25401880.

The previous prime is 25401839. The next prime is 25401889. The reversal of 25401881 is 18810452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20070400 + 5331481 = 4480^2 + 2309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25401881 is a prime.

It is a super-2 number, since 2×25401881² = 1290511116676322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25401889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12700940 + 12700941.

It is an arithmetic number, because the mean of its divisors is an integer number (12700941).

Almost surely, 2^25401881 is an apocalyptic number.

It is an amenable number.

25401881 is a deficient number, since it is larger than the sum of its proper divisors (1).

25401881 is an equidigital number, since it uses as much as digits as its factorization.

25401881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 25401881 is about 5040.0278769070. The cubic root of 25401881 is about 293.9602619560.

The spelling of 25401881 in words is "twenty-five million, four hundred one thousand, eight hundred eighty-one".