90171017109 has 12 divisors (see below), whose sum is σ = 137908614636. Its totient is φ = 56577892992.

The previous prime is 90171017089. The next prime is 90171017117.

90171017109 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 67355820900 + 22815196209 = 259530^2 + 151047^2 .

It is not a de Polignac number, because 90171017109 - 2⁸ = 90171016853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90171017119) 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, 294676374 + ... + 294676679.

It is an arithmetic number, because the mean of its divisors is an integer number (11492384553).

Almost surely, 2^90171017109 is an apocalyptic number.

It is an amenable number.

90171017109 is a deficient number, since it is larger than the sum of its proper divisors (47737597527).

90171017109 is a wasteful number, since it uses less digits than its factorization.

90171017109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589353076 (or 589353073 counting only the distinct ones).

The product of its (nonzero) digits is 3969, while the sum is 36.

It can be divided in two parts, 901710 and 17109, that added together give a palindrome (918819).

The spelling of 90171017109 in words is "ninety billion, one hundred seventy-one million, seventeen thousand, one hundred nine".