25921145 has 8 divisors (see below), whose sum is σ = 31413960. Its totient is φ = 20531200.

The previous prime is 25921121. The next prime is 25921151. The reversal of 25921145 is 54112952.

It can be written as a sum of positive squares in 4 ways, for example, as 14115049 + 11806096 = 3757^2 + 3436^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-25921145 is a prime.

It is a super-2 number, since 2×25921145² = 1343811516222050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25160 + ... + 26169.

It is an arithmetic number, because the mean of its divisors is an integer number (3926745).

Almost surely, 2^25921145 is an apocalyptic number.

It is an amenable number.

25921145 is a deficient number, since it is larger than the sum of its proper divisors (5492815).

25921145 is a wasteful number, since it uses less digits than its factorization.

25921145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51435.

The product of its digits is 3600, while the sum is 29.

The square root of 25921145 is about 5091.2812729214. The cubic root of 25921145 is about 295.9498065913.

The spelling of 25921145 in words is "twenty-five million, nine hundred twenty-one thousand, one hundred forty-five".