25520101 has 4 divisors (see below), whose sum is σ = 25562752. Its totient is φ = 25477452.

The previous prime is 25520071. The next prime is 25520123. The reversal of 25520101 is 10102552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25520101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25520141) 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, 20415 + ... + 21628.

It is an arithmetic number, because the mean of its divisors is an integer number (6390688).

Almost surely, 2^25520101 is an apocalyptic number.

It is an amenable number.

25520101 is a deficient number, since it is larger than the sum of its proper divisors (42651).

25520101 is an equidigital number, since it uses as much as digits as its factorization.

25520101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42650.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 25520101 is about 5051.7423726869. The cubic root of 25520101 is about 294.4155853155.

Adding to 25520101 its reverse (10102552), we get a palindrome (35622653).

The spelling of 25520101 in words is "twenty-five million, five hundred twenty thousand, one hundred one".