25991045 has 16 divisors (see below), whose sum is σ = 33239808. Its totient is φ = 19441920.

The previous prime is 25991039. The next prime is 25991071. The reversal of 25991045 is 54019952.

It is not a de Polignac number, because 25991045 - 2⁴ = 25991029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25990996 and 25991014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13280 + ... + 15110.

It is an arithmetic number, because the mean of its divisors is an integer number (2077488).

Almost surely, 2^25991045 is an apocalyptic number.

It is an amenable number.

25991045 is a deficient number, since it is larger than the sum of its proper divisors (7248763).

25991045 is a wasteful number, since it uses less digits than its factorization.

25991045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 25991045 is about 5098.1413279743. The cubic root of 25991045 is about 296.2155912015.

The spelling of 25991045 in words is "twenty-five million, nine hundred ninety-one thousand, forty-five".