25820131 has 4 divisors (see below), whose sum is σ = 25855264. Its totient is φ = 25785000.

The previous prime is 25820129. The next prime is 25820147. The reversal of 25820131 is 13102852.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25820131 - 2¹ = 25820129 is a prime.

It is a super-2 number, since 2×25820131² = 1333358329714322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25820101) 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, 16440 + ... + 17941.

It is an arithmetic number, because the mean of its divisors is an integer number (6463816).

Almost surely, 2^25820131 is an apocalyptic number.

25820131 is a deficient number, since it is larger than the sum of its proper divisors (35133).

25820131 is an equidigital number, since it uses as much as digits as its factorization.

25820131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35132.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 25820131 is about 5081.3512966533. The cubic root of 25820131 is about 295.5648700014.

Adding to 25820131 its reverse (13102852), we get a palindrome (38922983).

The spelling of 25820131 in words is "twenty-five million, eight hundred twenty thousand, one hundred thirty-one".