25220479 has 2 divisors, whose sum is σ = 25220480. Its totient is φ = 25220478.

The previous prime is 25220471. The next prime is 25220491. The reversal of 25220479 is 97402252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25220479 - 2³ = 25220471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25220479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25220471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12610239 + 12610240.

It is an arithmetic number, because the mean of its divisors is an integer number (12610240).

Almost surely, 2^25220479 is an apocalyptic number.

25220479 is a deficient number, since it is larger than the sum of its proper divisors (1).

25220479 is an equidigital number, since it uses as much as digits as its factorization.

25220479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 25220479 is about 5021.9995021903. Note that the first 3 decimals coincide. The cubic root of 25220479 is about 293.2588385497.

The spelling of 25220479 in words is "twenty-five million, two hundred twenty thousand, four hundred seventy-nine".