25520891 has 8 divisors (see below), whose sum is σ = 28102464. Its totient is φ = 22982920.

The previous prime is 25520881. The next prime is 25520897. The reversal of 25520891 is 19802552.

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

It is a cyclic number.

It is not a de Polignac number, because 25520891 - 2⁶ = 25520827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25520897) 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, 9665 + ... + 12018.

It is an arithmetic number, because the mean of its divisors is an integer number (3512808).

Almost surely, 2^25520891 is an apocalyptic number.

25520891 is a deficient number, since it is larger than the sum of its proper divisors (2581573).

25520891 is a wasteful number, since it uses less digits than its factorization.

25520891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21801.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 25520891 is about 5051.8205629258. The cubic root of 25520891 is about 294.4186232595.

The spelling of 25520891 in words is "twenty-five million, five hundred twenty thousand, eight hundred ninety-one".