90821113709 has 4 divisors (see below), whose sum is σ = 90975835104. Its totient is φ = 90666392316.

The previous prime is 90821113693. The next prime is 90821113717. The reversal of 90821113709 is 90731112809.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90821113709 - 2⁴ = 90821113693 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 (90821118709) 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, 77359817 + ... + 77360990.

It is an arithmetic number, because the mean of its divisors is an integer number (22743958776).

Almost surely, 2^90821113709 is an apocalyptic number.

It is an amenable number.

90821113709 is a deficient number, since it is larger than the sum of its proper divisors (154721395).

90821113709 is a wasteful number, since it uses less digits than its factorization.

90821113709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154721394.

The product of its (nonzero) digits is 27216, while the sum is 41.

The spelling of 90821113709 in words is "ninety billion, eight hundred twenty-one million, one hundred thirteen thousand, seven hundred nine".