1025840813 has 2 divisors, whose sum is σ = 1025840814. Its totient is φ = 1025840812.

The previous prime is 1025840801. The next prime is 1025840887. The reversal of 1025840813 is 3180485201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 579701929 + 446138884 = 24077^2 + 21122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1025840813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1025840813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1025845813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512920406 + 512920407.

It is an arithmetic number, because the mean of its divisors is an integer number (512920407).

Almost surely, 2^1025840813 is an apocalyptic number.

It is an amenable number.

1025840813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025840813 is an equidigital number, since it uses as much as digits as its factorization.

1025840813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 1025840813 is about 32028.7497882762. The cubic root of 1025840813 is about 1008.5404572775.

The spelling of 1025840813 in words is "one billion, twenty-five million, eight hundred forty thousand, eight hundred thirteen".