25521701 has 2 divisors, whose sum is σ = 25521702. Its totient is φ = 25521700.

The previous prime is 25521679. The next prime is 25521703. The reversal of 25521701 is 10712552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15288100 + 10233601 = 3910^2 + 3199^2 .

It is a cyclic number.

It is not a de Polignac number, because 25521701 - 2⁶ = 25521637 is a prime.

Together with 25521703, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25521703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12760850 + 12760851.

It is an arithmetic number, because the mean of its divisors is an integer number (12760851).

Almost surely, 2^25521701 is an apocalyptic number.

It is an amenable number.

25521701 is a deficient number, since it is larger than the sum of its proper divisors (1).

25521701 is an equidigital number, since it uses as much as digits as its factorization.

25521701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 25521701 is about 5051.9007314079. The cubic root of 25521701 is about 294.4217380483.

The spelling of 25521701 in words is "twenty-five million, five hundred twenty-one thousand, seven hundred one".