25211505 has 32 divisors (see below), whose sum is σ = 44955648. Its totient is φ = 11960000.

The previous prime is 25211477. The next prime is 25211513. The reversal of 25211505 is 50511252.

It is not a de Polignac number, because 25211505 - 2⁹ = 25210993 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6130 + ... + 9380.

It is an arithmetic number, because the mean of its divisors is an integer number (1404864).

Almost surely, 2^25211505 is an apocalyptic number.

It is an amenable number.

25211505 is a deficient number, since it is larger than the sum of its proper divisors (19744143).

25211505 is a wasteful number, since it uses less digits than its factorization.

25211505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3317.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 25211505 is about 5021.1059538711. The cubic root of 25211505 is about 293.2240517795.

Adding to 25211505 its reverse (50511252), we get a palindrome (75722757).

The spelling of 25211505 in words is "twenty-five million, two hundred eleven thousand, five hundred five".