2500009261 has 2 divisors, whose sum is σ = 2500009262. Its totient is φ = 2500009260.

The previous prime is 2500009241. The next prime is 2500009271. The reversal of 2500009261 is 1629000052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1924489161 + 575520100 = 43869^2 + 23990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2500009261 - 2¹³ = 2500001069 is a prime.

It is a super-2 number, since 2×2500009261² = 12500092610171532242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2500009241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250004630 + 1250004631.

It is an arithmetic number, because the mean of its divisors is an integer number (1250004631).

Almost surely, 2^2500009261 is an apocalyptic number.

It is an amenable number.

2500009261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2500009261 is an equidigital number, since it uses as much as digits as its factorization.

2500009261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 2500009261 is about 50000.0926099142. The cubic root of 2500009261 is about 1357.2104841768.

The spelling of 2500009261 in words is "two billion, five hundred million, nine thousand, two hundred sixty-one".