93821081 has 4 divisors (see below), whose sum is σ = 93965412. Its totient is φ = 93676752.

The previous prime is 93821027. The next prime is 93821087. The reversal of 93821081 is 18012839.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18012839 = 13 ⋅1385603.

It can be written as a sum of positive squares in 2 ways, for example, as 68227600 + 25593481 = 8260^2 + 5059^2 .

It is a cyclic number.

It is not a de Polignac number, because 93821081 - 2¹⁸ = 93558937 is a prime.

It is a super-2 number, since 2×93821081² = 17604790480017122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (93821087) 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, 71186 + ... + 72491.

It is an arithmetic number, because the mean of its divisors is an integer number (23491353).

Almost surely, 2^93821081 is an apocalyptic number.

It is an amenable number.

93821081 is a deficient number, since it is larger than the sum of its proper divisors (144331).

93821081 is a wasteful number, since it uses less digits than its factorization.

93821081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144330.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 93821081 is about 9686.1282770775. The cubic root of 93821081 is about 454.3949305360.

The spelling of 93821081 in words is "ninety-three million, eight hundred twenty-one thousand, eighty-one".