25906501 has 4 divisors (see below), whose sum is σ = 25917772. Its totient is φ = 25895232.

The previous prime is 25906477. The next prime is 25906513. The reversal of 25906501 is 10560952.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 21846276 + 4060225 = 4674^2 + 2015^2 .

It is a cyclic number.

It is not a de Polignac number, because 25906501 - 2¹³ = 25898309 is a prime.

It is a super-2 number, since 2×25906501² = 1342293588126002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25906501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25906561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 810 + ... + 7243.

It is an arithmetic number, because the mean of its divisors is an integer number (6479443).

Almost surely, 2^25906501 is an apocalyptic number.

It is an amenable number.

25906501 is a deficient number, since it is larger than the sum of its proper divisors (11271).

25906501 is an equidigital number, since it uses as much as digits as its factorization.

25906501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11270.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 25906501 is about 5089.8429248848. The cubic root of 25906501 is about 295.8940643860.

Adding to 25906501 its product of nonzero digits (2700), we get a triangular number (25909201 = T₇₁₉₈).

The spelling of 25906501 in words is "twenty-five million, nine hundred six thousand, five hundred one".