93421991 has 4 divisors (see below), whose sum is σ = 100608312. Its totient is φ = 86235672.

The previous prime is 93421973. The next prime is 93422009. The reversal of 93421991 is 19912439.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19912439 = 3919 ⋅5081.

It is an interprime number because it is at equal distance from previous prime (93421973) and next prime (93422009).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-93421991 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 (93421091) 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, 3593141 + ... + 3593166.

It is an arithmetic number, because the mean of its divisors is an integer number (25152078).

Almost surely, 2^93421991 is an apocalyptic number.

93421991 is a deficient number, since it is larger than the sum of its proper divisors (7186321).

93421991 is a wasteful number, since it uses less digits than its factorization.

93421991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7186320.

The product of its digits is 17496, while the sum is 38.

The square root of 93421991 is about 9665.5052118345. The cubic root of 93421991 is about 453.7497229746.

The spelling of 93421991 in words is "ninety-three million, four hundred twenty-one thousand, nine hundred ninety-one".