25502161 has 4 divisors (see below), whose sum is σ = 26844400. Its totient is φ = 24159924.

The previous prime is 25502131. The next prime is 25502167. The reversal of 25502161 is 16120552.

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 not a de Polignac number, because 25502161 - 2⁷ = 25502033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25502167) 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, 671091 + ... + 671128.

It is an arithmetic number, because the mean of its divisors is an integer number (6711100).

Almost surely, 2^25502161 is an apocalyptic number.

It is an amenable number.

25502161 is a deficient number, since it is larger than the sum of its proper divisors (1342239).

25502161 is a wasteful number, since it uses less digits than its factorization.

25502161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342238.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 25502161 is about 5049.9664355320. The cubic root of 25502161 is about 294.3465801844.

The spelling of 25502161 in words is "twenty-five million, five hundred two thousand, one hundred sixty-one".