7725499409 has 2 divisors, whose sum is σ = 7725499410. Its totient is φ = 7725499408.

The previous prime is 7725499381. The next prime is 7725499433. The reversal of 7725499409 is 9049945277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7241499409 + 484000000 = 85097^2 + 22000^2 .

It is a cyclic number.

It is not a de Polignac number, because 7725499409 - 2¹⁶ = 7725433873 is a prime.

It is a super-2 number, since 2×7725499409² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7725499469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3862749704 + 3862749705.

It is an arithmetic number, because the mean of its divisors is an integer number (3862749705).

Almost surely, 2^7725499409 is an apocalyptic number.

It is an amenable number.

7725499409 is a deficient number, since it is larger than the sum of its proper divisors (1).

7725499409 is an equidigital number, since it uses as much as digits as its factorization.

7725499409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5715360, while the sum is 56.

The square root of 7725499409 is about 87894.8201488575. The cubic root of 7725499409 is about 1976.8582123665.

The spelling of 7725499409 in words is "seven billion, seven hundred twenty-five million, four hundred ninety-nine thousand, four hundred nine".