94807981089721 has 3 divisors (see below), whose sum is σ = 94807990826661. Its totient is φ = 94807971352782.

The previous prime is 94807981089677. The next prime is 94807981089743. The reversal of 94807981089721 is 12798018970849.

The square root of 94807981089721 is 9736939.

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 94807981089721 - 2⁴⁵ = 59623609000889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (94807981089761) 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, 4868470 + ... + 14605408.

It is an arithmetic number, because the mean of its divisors is an integer number (31602663608887).

Almost surely, 2^{94807981089721} is an apocalyptic number.

94807981089721 is the 9736939-th square number.

94807981089721 is the 4868470-th centered octagonal number.

It is an amenable number.

94807981089721 is a deficient number, since it is larger than the sum of its proper divisors (9736940).

94807981089721 is an frugal number, since it uses more digits than its factorization.

94807981089721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19473878 (or 9736939 counting only the distinct ones).

The product of its (nonzero) digits is 146313216, while the sum is 73.

The spelling of 94807981089721 in words is "ninety-four trillion, eight hundred seven billion, nine hundred eighty-one million, eighty-nine thousand, seven hundred twenty-one".