1026530865 has 12 divisors (see below), whose sum is σ = 1779320244. Its totient is φ = 547483104.

The previous prime is 1026530861. The next prime is 1026530867. The reversal of 1026530865 is 5680356201.

It can be written as a sum of positive squares in 2 ways, for example, as 275825664 + 750705201 = 16608^2 + 27399^2 .

It is not a de Polignac number, because 1026530865 - 2² = 1026530861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1026530861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11405854 + ... + 11405943.

It is an arithmetic number, because the mean of its divisors is an integer number (148276687).

Almost surely, 2^1026530865 is an apocalyptic number.

1026530865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1026530865 is a deficient number, since it is larger than the sum of its proper divisors (752789379).

1026530865 is a wasteful number, since it uses less digits than its factorization.

1026530865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22811808 (or 22811805 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1026530865 is about 32039.5203615784. The cubic root of 1026530865 is about 1008.7665447828.

The spelling of 1026530865 in words is "one billion, twenty-six million, five hundred thirty thousand, eight hundred sixty-five".