25516129 has 4 divisors (see below), whose sum is σ = 25606576. Its totient is φ = 25425684.

The previous prime is 25516123. The next prime is 25516147. The reversal of 25516129 is 92161552.

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 a cyclic number.

It is not a de Polignac number, because 25516129 - 2¹¹ = 25514081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25516129.

It is not an unprimeable number, because it can be changed into a prime (25516123) 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, 44799 + ... + 45364.

It is an arithmetic number, because the mean of its divisors is an integer number (6401644).

Almost surely, 2^25516129 is an apocalyptic number.

It is an amenable number.

25516129 is a deficient number, since it is larger than the sum of its proper divisors (90447).

25516129 is an equidigital number, since it uses as much as digits as its factorization.

25516129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90446.

The product of its digits is 5400, while the sum is 31.

The square root of 25516129 is about 5051.3492257020. The cubic root of 25516129 is about 294.4003100444.

It can be divided in two parts, 255 and 16129, that added together give a 14-th power (16384 = 2¹⁴).

The spelling of 25516129 in words is "twenty-five million, five hundred sixteen thousand, one hundred twenty-nine".