93731994721 has 4 divisors (see below), whose sum is σ = 96964132500. Its totient is φ = 90499856944.

The previous prime is 93731994679. The next prime is 93731994731. The reversal of 93731994721 is 12749913739.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12749913739 = 35803 ⋅356113.

It can be written as a sum of positive squares in 2 ways, for example, as 53224797025 + 40507197696 = 230705^2 + 201264^2 .

It is a cyclic number.

It is not a de Polignac number, because 93731994721 - 2¹³ = 93731986529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (93731994731) 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, 1616068846 + ... + 1616068903.

It is an arithmetic number, because the mean of its divisors is an integer number (24241033125).

Almost surely, 2^93731994721 is an apocalyptic number.

It is an amenable number.

93731994721 is a deficient number, since it is larger than the sum of its proper divisors (3232137779).

93731994721 is a wasteful number, since it uses less digits than its factorization.

93731994721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232137778.

The product of its digits is 2571912, while the sum is 55.

The spelling of 93731994721 in words is "ninety-three billion, seven hundred thirty-one million, nine hundred ninety-four thousand, seven hundred twenty-one".