90709000861 has 4 divisors (see below), whose sum is σ = 92196033724. Its totient is φ = 89221968000.

The previous prime is 90709000859. The next prime is 90709000867. The reversal of 90709000861 is 16800090709.

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 52608303225 + 38100697636 = 229365^2 + 195194^2 .

It is a cyclic number.

It is not a de Polignac number, because 90709000861 - 2¹ = 90709000859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90709000867) 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, 743516340 + ... + 743516461.

It is an arithmetic number, because the mean of its divisors is an integer number (23049008431).

Almost surely, 2^90709000861 is an apocalyptic number.

90709000861 is the 134692-nd centered decagonal number.

It is an amenable number.

90709000861 is a deficient number, since it is larger than the sum of its proper divisors (1487032863).

90709000861 is a wasteful number, since it uses less digits than its factorization.

90709000861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487032862.

The product of its (nonzero) digits is 27216, while the sum is 40.

The spelling of 90709000861 in words is "ninety billion, seven hundred nine million, eight hundred sixty-one", and thus it is an aban number.