25128977 has 2 divisors, whose sum is σ = 25128978. Its totient is φ = 25128976.

The previous prime is 25128947. The next prime is 25128989. The reversal of 25128977 is 77982152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17505856 + 7623121 = 4184^2 + 2761^2 .

It is a cyclic number.

It is not a de Polignac number, because 25128977 - 2⁶ = 25128913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25128937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12564488 + 12564489.

It is an arithmetic number, because the mean of its divisors is an integer number (12564489).

Almost surely, 2^25128977 is an apocalyptic number.

It is an amenable number.

25128977 is a deficient number, since it is larger than the sum of its proper divisors (1).

25128977 is an equidigital number, since it uses as much as digits as its factorization.

25128977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 25128977 is about 5012.8811077064. The cubic root of 25128977 is about 292.9037529394.

The spelling of 25128977 in words is "twenty-five million, one hundred twenty-eight thousand, nine hundred seventy-seven".