25708531 has 2 divisors, whose sum is σ = 25708532. Its totient is φ = 25708530.

The previous prime is 25708519. The next prime is 25708541. The reversal of 25708531 is 13580752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25708531 - 2⁵ = 25708499 is a prime.

It is a super-2 number, since 2×25708531² = 1321857132355922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25708493 and 25708502.

It is not a weakly prime, because it can be changed into another prime (25708541) 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, 12854265 + 12854266.

It is an arithmetic number, because the mean of its divisors is an integer number (12854266).

Almost surely, 2^25708531 is an apocalyptic number.

25708531 is a deficient number, since it is larger than the sum of its proper divisors (1).

25708531 is an equidigital number, since it uses as much as digits as its factorization.

25708531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 25708531 is about 5070.3580741403. The cubic root of 25708531 is about 295.1384239766.

The spelling of 25708531 in words is "twenty-five million, seven hundred eight thousand, five hundred thirty-one".