25529501 has 2 divisors, whose sum is σ = 25529502. Its totient is φ = 25529500.

The previous prime is 25529473. The next prime is 25529503. The reversal of 25529501 is 10592552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25512601 + 16900 = 5051^2 + 130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25529501 is a prime.

It is a Sophie Germain prime.

Together with 25529503, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25529503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12764750 + 12764751.

It is an arithmetic number, because the mean of its divisors is an integer number (12764751).

Almost surely, 2^25529501 is an apocalyptic number.

It is an amenable number.

25529501 is a deficient number, since it is larger than the sum of its proper divisors (1).

25529501 is an equidigital number, since it uses as much as digits as its factorization.

25529501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 25529501 is about 5052.6726590984. The cubic root of 25529501 is about 294.4517289391.

The spelling of 25529501 in words is "twenty-five million, five hundred twenty-nine thousand, five hundred one".