1028313561 has 16 divisors (see below), whose sum is σ = 1583713728. Its totient is φ = 586560000.

The previous prime is 1028313553. The next prime is 1028313569. The reversal of 1028313561 is 1653138201.

It is an interprime number because it is at equal distance from previous prime (1028313553) and next prime (1028313569).

It is not a de Polignac number, because 1028313561 - 2³ = 1028313553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1028313569) 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 in 15 ways as a sum of consecutive naturals, for example, 915940 + ... + 917061.

It is an arithmetic number, because the mean of its divisors is an integer number (98982108).

Almost surely, 2^1028313561 is an apocalyptic number.

1028313561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1028313561 is a deficient number, since it is larger than the sum of its proper divisors (555400167).

1028313561 is a wasteful number, since it uses less digits than its factorization.

1028313561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833032.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1028313561 is about 32067.3285603899. The cubic root of 1028313561 is about 1009.3501557733.

The spelling of 1028313561 in words is "one billion, twenty-eight million, three hundred thirteen thousand, five hundred sixty-one".