93971921 has 4 divisors (see below), whose sum is σ = 94110192. Its totient is φ = 93833652.

The previous prime is 93971909. The next prime is 93971939. The reversal of 93971921 is 12917939.

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 93971921 - 2¹⁰ = 93970897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (93971021) 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, 68111 + ... + 69476.

It is an arithmetic number, because the mean of its divisors is an integer number (23527548).

Almost surely, 2^93971921 is an apocalyptic number.

It is an amenable number.

93971921 is a deficient number, since it is larger than the sum of its proper divisors (138271).

93971921 is a wasteful number, since it uses less digits than its factorization.

93971921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138270.

The product of its digits is 30618, while the sum is 41.

The square root of 93971921 is about 9693.9115428190. The cubic root of 93971921 is about 454.6383166043.

The spelling of 93971921 in words is "ninety-three million, nine hundred seventy-one thousand, nine hundred twenty-one".