1025696809 has 2 divisors, whose sum is σ = 1025696810. Its totient is φ = 1025696808.

The previous prime is 1025696807. The next prime is 1025696821. The reversal of 1025696809 is 9086965201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 914457600 + 111239209 = 30240^2 + 10547^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025696809 - 2¹ = 1025696807 is a prime.

Together with 1025696807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1025696803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512848404 + 512848405.

It is an arithmetic number, because the mean of its divisors is an integer number (512848405).

Almost surely, 2^1025696809 is an apocalyptic number.

It is an amenable number.

1025696809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025696809 is an equidigital number, since it uses as much as digits as its factorization.

1025696809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 1025696809 is about 32026.5016665886. The cubic root of 1025696809 is about 1008.4932632573.

The spelling of 1025696809 in words is "one billion, twenty-five million, six hundred ninety-six thousand, eight hundred nine".