1025750809 has 2 divisors, whose sum is σ = 1025750810. Its totient is φ = 1025750808.

The previous prime is 1025750801. The next prime is 1025750821. The reversal of 1025750809 is 9080575201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 983136025 + 42614784 = 31355^2 + 6528^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025750809 - 2³ = 1025750801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1025750801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512875404 + 512875405.

It is an arithmetic number, because the mean of its divisors is an integer number (512875405).

Almost surely, 2^1025750809 is an apocalyptic number.

It is an amenable number.

1025750809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025750809 is an equidigital number, since it uses as much as digits as its factorization.

1025750809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 1025750809 is about 32027.3447072966. The cubic root of 1025750809 is about 1008.5109610409.

The spelling of 1025750809 in words is "one billion, twenty-five million, seven hundred fifty thousand, eight hundred nine".