25128481 has 4 divisors (see below), whose sum is σ = 28718272. Its totient is φ = 21538692.

The previous prime is 25128479. The next prime is 25128487. The reversal of 25128481 is 18482152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25128481 - 2¹ = 25128479 is a prime.

It is a super-2 number, since 2×25128481² = 1262881114734722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25128487) 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, 1794885 + ... + 1794898.

It is an arithmetic number, because the mean of its divisors is an integer number (7179568).

Almost surely, 2^25128481 is an apocalyptic number.

It is an amenable number.

25128481 is a deficient number, since it is larger than the sum of its proper divisors (3589791).

25128481 is an equidigital number, since it uses as much as digits as its factorization.

25128481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589790.

The product of its digits is 5120, while the sum is 31.

The square root of 25128481 is about 5012.8316349145. The cubic root of 25128481 is about 292.9018257988.

The spelling of 25128481 in words is "twenty-five million, one hundred twenty-eight thousand, four hundred eighty-one".