106321993 has 4 divisors (see below), whose sum is σ = 107374788. Its totient is φ = 105269200.

The previous prime is 106321973. The next prime is 106321997. The reversal of 106321993 is 399123601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399123601 = 13309 ⋅29989.

It can be written as a sum of positive squares in 2 ways, for example, as 80138304 + 26183689 = 8952^2 + 5117^2 .

It is a cyclic number.

It is not a de Polignac number, because 106321993 - 2¹⁷ = 106190921 is a prime.

It is a super-2 number, since 2×106321993² = 22608732390984098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106321997) 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, 526246 + ... + 526447.

It is an arithmetic number, because the mean of its divisors is an integer number (26843697).

Almost surely, 2^106321993 is an apocalyptic number.

It is an amenable number.

106321993 is a deficient number, since it is larger than the sum of its proper divisors (1052795).

106321993 is a wasteful number, since it uses less digits than its factorization.

106321993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052794.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 106321993 is about 10311.2556461374. The cubic root of 106321993 is about 473.7410696284.

The spelling of 106321993 in words is "one hundred six million, three hundred twenty-one thousand, nine hundred ninety-three".