25642501 has 2 divisors, whose sum is σ = 25642502. Its totient is φ = 25642500.

The previous prime is 25642499. The next prime is 25642523. The reversal of 25642501 is 10524652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25250625 + 391876 = 5025^2 + 626^2 .

It is a cyclic number.

It is not a de Polignac number, because 25642501 - 2¹ = 25642499 is a prime.

Together with 25642499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25642541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12821250 + 12821251.

It is an arithmetic number, because the mean of its divisors is an integer number (12821251).

Almost surely, 2^25642501 is an apocalyptic number.

It is an amenable number.

25642501 is a deficient number, since it is larger than the sum of its proper divisors (1).

25642501 is an equidigital number, since it uses as much as digits as its factorization.

25642501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 25642501 is about 5063.8425133489. The cubic root of 25642501 is about 294.8855286977.

The spelling of 25642501 in words is "twenty-five million, six hundred forty-two thousand, five hundred one".