93969821 has 4 divisors (see below), whose sum is σ = 102512544. Its totient is φ = 85427100.

The previous prime is 93969803. The next prime is 93969823. The reversal of 93969821 is 12896939.

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 de Polignac number, because none of the positive numbers 2^k-93969821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (93969823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4271345 + ... + 4271366.

It is an arithmetic number, because the mean of its divisors is an integer number (25628136).

Almost surely, 2^93969821 is an apocalyptic number.

It is an amenable number.

93969821 is a deficient number, since it is larger than the sum of its proper divisors (8542723).

93969821 is a wasteful number, since it uses less digits than its factorization.

93969821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8542722.

The product of its digits is 209952, while the sum is 47.

The square root of 93969821 is about 9693.8032268042. The cubic root of 93969821 is about 454.6349299629.

The spelling of 93969821 in words is "ninety-three million, nine hundred sixty-nine thousand, eight hundred twenty-one".