521102091089 has 4 divisors (see below), whose sum is σ = 521161633956. Its totient is φ = 521042548224.

The previous prime is 521102091071. The next prime is 521102091119. The reversal of 521102091089 is 980190201125.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 402473510464 + 118628580625 = 634408^2 + 344425^2 .

It is a cyclic number.

It is not a de Polignac number, because 521102091089 - 2¹⁶ = 521102025553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521102091049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29758304 + ... + 29775809.

It is an arithmetic number, because the mean of its divisors is an integer number (130290408489).

Almost surely, 2^521102091089 is an apocalyptic number.

It is an amenable number.

521102091089 is a deficient number, since it is larger than the sum of its proper divisors (59542867).

521102091089 is an equidigital number, since it uses as much as digits as its factorization.

521102091089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59542866.

The product of its (nonzero) digits is 12960, while the sum is 38.

The spelling of 521102091089 in words is "five hundred twenty-one billion, one hundred two million, ninety-one thousand, eighty-nine".