25509947 has 2 divisors, whose sum is σ = 25509948. Its totient is φ = 25509946.

The previous prime is 25509943. The next prime is 25509961. The reversal of 25509947 is 74990552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25509947 - 2² = 25509943 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25509943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12754973 + 12754974.

It is an arithmetic number, because the mean of its divisors is an integer number (12754974).

Almost surely, 2^25509947 is an apocalyptic number.

25509947 is a deficient number, since it is larger than the sum of its proper divisors (1).

25509947 is an equidigital number, since it uses as much as digits as its factorization.

25509947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 25509947 is about 5050.7372729137. The cubic root of 25509947 is about 294.3765325386.

The spelling of 25509947 in words is "twenty-five million, five hundred nine thousand, nine hundred forty-seven".