25401505 has 4 divisors (see below), whose sum is σ = 30481812. Its totient is φ = 20321200.

The previous prime is 25401491. The next prime is 25401511. The reversal of 25401505 is 50510452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14085009 + 11316496 = 3753^2 + 3364^2 .

It is not a de Polignac number, because 25401505 - 2¹¹ = 25399457 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2540146 + ... + 2540155.

It is an arithmetic number, because the mean of its divisors is an integer number (7620453).

Almost surely, 2^25401505 is an apocalyptic number.

It is an amenable number.

25401505 is a deficient number, since it is larger than the sum of its proper divisors (5080307).

25401505 is an equidigital number, since it uses as much as digits as its factorization.

25401505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080306.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 25401505 is about 5039.9905753880. The cubic root of 25401505 is about 293.9588115437.

Adding to 25401505 its reverse (50510452), we get a palindrome (75911957).

The spelling of 25401505 in words is "twenty-five million, four hundred one thousand, five hundred five".