2025128309 has 2 divisors, whose sum is σ = 2025128310. Its totient is φ = 2025128308.

The previous prime is 2025128299. The next prime is 2025128317. The reversal of 2025128309 is 9038215202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1822863025 + 202265284 = 42695^2 + 14222^2 .

It is a cyclic number.

It is not a de Polignac number, because 2025128309 - 2²⁸ = 1756692853 is a prime.

It is a super-2 number, since 2×2025128309² = 8202289335826398962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2025128359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1012564154 + 1012564155.

It is an arithmetic number, because the mean of its divisors is an integer number (1012564155).

Almost surely, 2^2025128309 is an apocalyptic number.

It is an amenable number.

2025128309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2025128309 is an equidigital number, since it uses as much as digits as its factorization.

2025128309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 2025128309 is about 45001.4256329730. The cubic root of 2025128309 is about 1265.1757183764.

The spelling of 2025128309 in words is "two billion, twenty-five million, one hundred twenty-eight thousand, three hundred nine".