25007531 has 2 divisors, whose sum is σ = 25007532. Its totient is φ = 25007530.

The previous prime is 25007519. The next prime is 25007533. The reversal of 25007531 is 13570052.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25007531 is a prime.

It is a super-2 number, since 2×25007531² = 1250753213431922, which contains 22 as substring.

Together with 25007533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25007497 and 25007506.

It is not a weakly prime, because it can be changed into another prime (25007533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12503765 + 12503766.

It is an arithmetic number, because the mean of its divisors is an integer number (12503766).

Almost surely, 2^25007531 is an apocalyptic number.

25007531 is a deficient number, since it is larger than the sum of its proper divisors (1).

25007531 is an equidigital number, since it uses as much as digits as its factorization.

25007531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 25007531 is about 5000.7530432926. The cubic root of 25007531 is about 292.4311319103.

Adding to 25007531 its reverse (13570052), we get a palindrome (38577583).

The spelling of 25007531 in words is "twenty-five million, seven thousand, five hundred thirty-one".