90077923101721 has 3 divisors (see below), whose sum is σ = 90077932592661. Its totient is φ = 90077913610782.

The previous prime is 90077923101713. The next prime is 90077923101763. The reversal of 90077923101721 is 12710132977009.

It is a happy number.

The square root of 90077923101721 is 9490939.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 90077923101721 - 2³ = 90077923101713 is a prime.

It is a super-2 number, since 2×90077923101721² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90077923101421) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4745470 + ... + 14236408.

It is an arithmetic number, because the mean of its divisors is an integer number (30025977530887).

Almost surely, 2^{90077923101721} is an apocalyptic number.

90077923101721 is the 9490939-th square number.

90077923101721 is the 4745470-th centered octagonal number.

It is an amenable number.

90077923101721 is a deficient number, since it is larger than the sum of its proper divisors (9490940).

90077923101721 is an frugal number, since it uses more digits than its factorization.

90077923101721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18981878 (or 9490939 counting only the distinct ones).

The product of its (nonzero) digits is 333396, while the sum is 49.

The spelling of 90077923101721 in words is "ninety trillion, seventy-seven billion, nine hundred twenty-three million, one hundred one thousand, seven hundred twenty-one".