25278977 has 2 divisors, whose sum is σ = 25278978. Its totient is φ = 25278976.

The previous prime is 25278943. The next prime is 25278991. The reversal of 25278977 is 77987252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20421361 + 4857616 = 4519^2 + 2204^2 .

It is a cyclic number.

It is not a de Polignac number, because 25278977 - 2¹² = 25274881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25278907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12639488 + 12639489.

It is an arithmetic number, because the mean of its divisors is an integer number (12639489).

Almost surely, 2^25278977 is an apocalyptic number.

It is an amenable number.

25278977 is a deficient number, since it is larger than the sum of its proper divisors (1).

25278977 is an equidigital number, since it uses as much as digits as its factorization.

25278977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 47.

The square root of 25278977 is about 5027.8203030737. The cubic root of 25278977 is about 293.4853979407.

The spelling of 25278977 in words is "twenty-five million, two hundred seventy-eight thousand, nine hundred seventy-seven".