25121623 has 4 divisors (see below), whose sum is σ = 25166808. Its totient is φ = 25076440.

The previous prime is 25121617. The next prime is 25121633. The reversal of 25121623 is 32612152.

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

It is a cyclic number.

It is not a de Polignac number, because 25121623 - 2⁹ = 25121111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25121594 and 25121603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25121633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21748 + ... + 22873.

It is an arithmetic number, because the mean of its divisors is an integer number (6291702).

Almost surely, 2^25121623 is an apocalyptic number.

25121623 is a deficient number, since it is larger than the sum of its proper divisors (45185).

25121623 is an equidigital number, since it uses as much as digits as its factorization.

25121623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45184.

The product of its digits is 720, while the sum is 22.

The square root of 25121623 is about 5012.1475437182. The cubic root of 25121623 is about 292.8751773716.

Adding to 25121623 its reverse (32612152), we get a palindrome (57733775).

The spelling of 25121623 in words is "twenty-five million, one hundred twenty-one thousand, six hundred twenty-three".