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25129021 is a prime number
BaseRepresentation
bin101111111011…
…1000000111101
31202021200112111
41133313000331
522413112041
62254334021
7423410311
oct137670075
952250474
1025129021
1113203895
1284ba311
13528ab58
1434a1b41
152315981
hex17f703d

25129021 has 2 divisors, whose sum is σ = 25129022. Its totient is φ = 25129020.

The previous prime is 25129019. The next prime is 25129033. The reversal of 25129021 is 12092152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17757796 + 7371225 = 4214^2 + 2715^2 .

It is a cyclic number.

It is not a de Polignac number, because 25129021 - 21 = 25129019 is a prime.

Together with 25129019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 25128983 and 25129001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25129121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12564510 + 12564511.

It is an arithmetic number, because the mean of its divisors is an integer number (12564511).

Almost surely, 225129021 is an apocalyptic number.

25129021 is the 2680-th centered heptagonal number.

It is an amenable number.

25129021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25129021 is an equidigital number, since it uses as much as digits as its factorization.

25129021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 25129021 is about 5012.8854963983. The cubic root of 25129021 is about 292.9039238942.

The spelling of 25129021 in words is "twenty-five million, one hundred twenty-nine thousand, twenty-one".