25516123 has 2 divisors, whose sum is σ = 25516124. Its totient is φ = 25516122.

The previous prime is 25516103. The next prime is 25516147. The reversal of 25516123 is 32161552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25516123 - 2¹³ = 25507931 is a prime.

It is a super-2 number, since 2×25516123² = 1302145065902258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25516103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12758061 + 12758062.

It is an arithmetic number, because the mean of its divisors is an integer number (12758062).

Almost surely, 2^25516123 is an apocalyptic number.

25516123 is a deficient number, since it is larger than the sum of its proper divisors (1).

25516123 is an equidigital number, since it uses as much as digits as its factorization.

25516123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 25.

The square root of 25516123 is about 5051.3486318012. The cubic root of 25516123 is about 294.4002869688.

Adding to 25516123 its reverse (32161552), we get a palindrome (57677675).

The spelling of 25516123 in words is "twenty-five million, five hundred sixteen thousand, one hundred twenty-three".