25706531 has 2 divisors, whose sum is σ = 25706532. Its totient is φ = 25706530.

The previous prime is 25706507. The next prime is 25706579. The reversal of 25706531 is 13560752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25706531 - 2¹⁰ = 25705507 is a prime.

It is a super-2 number, since 2×25706531² = 1321651472107922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25706494 and 25706503.

It is not a weakly prime, because it can be changed into another prime (25706501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12853265 + 12853266.

It is an arithmetic number, because the mean of its divisors is an integer number (12853266).

Almost surely, 2^25706531 is an apocalyptic number.

25706531 is a deficient number, since it is larger than the sum of its proper divisors (1).

25706531 is an equidigital number, since it uses as much as digits as its factorization.

25706531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 25706531 is about 5070.1608455748. The cubic root of 25706531 is about 295.1307703284.

The spelling of 25706531 in words is "twenty-five million, seven hundred six thousand, five hundred thirty-one".