25547881 has 2 divisors, whose sum is σ = 25547882. Its totient is φ = 25547880.

The previous prime is 25547867. The next prime is 25547903. The reversal of 25547881 is 18874552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21706281 + 3841600 = 4659^2 + 1960^2 .

It is a cyclic number.

It is not a de Polignac number, because 25547881 - 2⁹ = 25547369 is a prime.

It is a super-2 number, since 2×25547881² = 1305388447180322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25547861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12773940 + 12773941.

It is an arithmetic number, because the mean of its divisors is an integer number (12773941).

Almost surely, 2^25547881 is an apocalyptic number.

It is an amenable number.

25547881 is a deficient number, since it is larger than the sum of its proper divisors (1).

25547881 is an equidigital number, since it uses as much as digits as its factorization.

25547881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89600, while the sum is 40.

The square root of 25547881 is about 5054.4911712258. The cubic root of 25547881 is about 294.5223756327.

The spelling of 25547881 in words is "twenty-five million, five hundred forty-seven thousand, eight hundred eighty-one".