93427991 has 4 divisors (see below), whose sum is σ = 93580032. Its totient is φ = 93275952.

The previous prime is 93427969. The next prime is 93427993. The reversal of 93427991 is 19972439.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19972439 = 19 ⋅1051181.

It is a cyclic number.

It is not a de Polignac number, because 93427991 - 2¹⁰ = 93426967 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 (93427993) 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, 75095 + ... + 76328.

It is an arithmetic number, because the mean of its divisors is an integer number (23395008).

Almost surely, 2^93427991 is an apocalyptic number.

93427991 is a deficient number, since it is larger than the sum of its proper divisors (152041).

93427991 is a wasteful number, since it uses less digits than its factorization.

93427991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152040.

The product of its digits is 122472, while the sum is 44.

The square root of 93427991 is about 9665.8155889713. The cubic root of 93427991 is about 453.7594367477.

The spelling of 93427991 in words is "ninety-three million, four hundred twenty-seven thousand, nine hundred ninety-one".