25820531 has 8 divisors (see below), whose sum is σ = 28767744. Its totient is φ = 22973320.

The previous prime is 25820521. The next prime is 25820537. The reversal of 25820531 is 13502852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25820531 is a prime.

It is a super-2 number, since 2×25820531² = 1333399642243922, 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 25820531.

It is not an unprimeable number, because it can be changed into a prime (25820537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24455 + ... + 25488.

It is an arithmetic number, because the mean of its divisors is an integer number (3595968).

Almost surely, 2^25820531 is an apocalyptic number.

25820531 is a deficient number, since it is larger than the sum of its proper divisors (2947213).

25820531 is a wasteful number, since it uses less digits than its factorization.

25820531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50001.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 25820531 is about 5081.3906561098. The cubic root of 25820531 is about 295.5663962697.

The spelling of 25820531 in words is "twenty-five million, eight hundred twenty thousand, five hundred thirty-one".