1065638531 has 4 divisors (see below), whose sum is σ = 1066339752. Its totient is φ = 1064937312.

The previous prime is 1065638527. The next prime is 1065638533. The reversal of 1065638531 is 1358365601.

1065638531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1065638531 - 2² = 1065638527 is a prime.

It is a super-2 number, since 2×1065638531² = 2271170957503675922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1065638533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348326 + ... + 351371.

It is an arithmetic number, because the mean of its divisors is an integer number (266584938).

Almost surely, 2^1065638531 is an apocalyptic number.

1065638531 is a deficient number, since it is larger than the sum of its proper divisors (701221).

1065638531 is an equidigital number, since it uses as much as digits as its factorization.

1065638531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701220.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 1065638531 is about 32644.1193938510. The cubic root of 1065638531 is about 1021.4175251366.

The spelling of 1065638531 in words is "one billion, sixty-five million, six hundred thirty-eight thousand, five hundred thirty-one".