25129121 has 2 divisors, whose sum is σ = 25129122. Its totient is φ = 25129120.

The previous prime is 25129099. The next prime is 25129129. The reversal of 25129121 is 12192152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20802721 + 4326400 = 4561^2 + 2080^2 .

It is a cyclic number.

It is not a de Polignac number, because 25129121 - 2¹⁸ = 24866977 is a prime.

It is a super-3 number, since 3×25129121³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (25129129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12564560 + 12564561.

It is an arithmetic number, because the mean of its divisors is an integer number (12564561).

Almost surely, 2^25129121 is an apocalyptic number.

It is an amenable number.

25129121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25129121 is an equidigital number, since it uses as much as digits as its factorization.

25129121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 23.

The square root of 25129121 is about 5012.8954706836. The cubic root of 25129121 is about 292.9043124271.

The spelling of 25129121 in words is "twenty-five million, one hundred twenty-nine thousand, one hundred twenty-one".