93721813 has 4 divisors (see below), whose sum is σ = 98654560. Its totient is φ = 88789068.

The previous prime is 93721801. The next prime is 93721819. The reversal of 93721813 is 31812739.

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 93721813 - 2⁵ = 93721781 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 (93721819) 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 3 ways as a sum of consecutive naturals, for example, 2466345 + ... + 2466382.

It is an arithmetic number, because the mean of its divisors is an integer number (24663640).

Almost surely, 2^93721813 is an apocalyptic number.

It is an amenable number.

93721813 is a deficient number, since it is larger than the sum of its proper divisors (4932747).

93721813 is a wasteful number, since it uses less digits than its factorization.

93721813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4932746.

The product of its digits is 9072, while the sum is 34.

The square root of 93721813 is about 9681.0026856726. The cubic root of 93721813 is about 454.2346154861.

The spelling of 93721813 in words is "ninety-three million, seven hundred twenty-one thousand, eight hundred thirteen".