93131721 has 16 divisors (see below), whose sum is σ = 139865920. Its totient is φ = 61236000.

The previous prime is 93131707. The next prime is 93131723. The reversal of 93131721 is 12713139.

It is not a de Polignac number, because 93131721 - 2¹⁸ = 92869577 is a prime.

It is a super-3 number, since 3×93131721³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (93131723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21655 + ... + 25596.

It is an arithmetic number, because the mean of its divisors is an integer number (8741620).

Almost surely, 2^93131721 is an apocalyptic number.

It is an amenable number.

93131721 is a deficient number, since it is larger than the sum of its proper divisors (46734199).

93131721 is a wasteful number, since it uses less digits than its factorization.

93131721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47333 (or 47327 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 93131721 is about 9650.4777601941. The cubic root of 93131721 is about 453.2792892009.

The spelling of 93131721 in words is "ninety-three million, one hundred thirty-one thousand, seven hundred twenty-one".