93427981 has 4 divisors (see below), whose sum is σ = 93791772. Its totient is φ = 93064192.

The previous prime is 93427969. The next prime is 93427993. The reversal of 93427981 is 18972439.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18972439 = 271 ⋅70009.

It is an interprime number because it is at equal distance from previous prime (93427969) and next prime (93427993).

It can be written as a sum of positive squares in 2 ways, for example, as 90079081 + 3348900 = 9491^2 + 1830^2 .

It is a cyclic number.

It is not a de Polignac number, because 93427981 - 2⁷ = 93427853 is a prime.

It is a super-2 number, since 2×93427981² = 17457575267472722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (93427951) 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, 181510 + ... + 182023.

It is an arithmetic number, because the mean of its divisors is an integer number (23447943).

Almost surely, 2^93427981 is an apocalyptic number.

It is an amenable number.

93427981 is a deficient number, since it is larger than the sum of its proper divisors (363791).

93427981 is a wasteful number, since it uses less digits than its factorization.

93427981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363790.

The product of its digits is 108864, while the sum is 43.

The square root of 93427981 is about 9665.8150716843. The cubic root of 93427981 is about 453.7594205584.

The spelling of 93427981 in words is "ninety-three million, four hundred twenty-seven thousand, nine hundred eighty-one".