25147861 has 2 divisors, whose sum is σ = 25147862. Its totient is φ = 25147860.

The previous prime is 25147853. The next prime is 25147873. The reversal of 25147861 is 16874152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15256836 + 9891025 = 3906^2 + 3145^2 .

It is a cyclic number.

It is not a de Polignac number, because 25147861 - 2³ = 25147853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25147841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12573930 + 12573931.

It is an arithmetic number, because the mean of its divisors is an integer number (12573931).

Almost surely, 2^25147861 is an apocalyptic number.

It is an amenable number.

25147861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25147861 is an equidigital number, since it uses as much as digits as its factorization.

25147861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 34.

The square root of 25147861 is about 5014.7643015400. The cubic root of 25147861 is about 292.9771053022.

The spelling of 25147861 in words is "twenty-five million, one hundred forty-seven thousand, eight hundred sixty-one".