19801093 has 4 divisors (see below), whose sum is σ = 21324268. Its totient is φ = 18277920.

The previous prime is 19801081. The next prime is 19801123. The reversal of 19801093 is 39010891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39010891 = 457 ⋅85363.

It can be written as a sum of positive squares in 2 ways, for example, as 1542564 + 18258529 = 1242^2 + 4273^2 .

It is a cyclic number.

It is not a de Polignac number, because 19801093 - 2¹³ = 19792901 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 (19801003) 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, 761568 + ... + 761593.

It is an arithmetic number, because the mean of its divisors is an integer number (5331067).

Almost surely, 2^19801093 is an apocalyptic number.

19801093 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19801093 is a deficient number, since it is larger than the sum of its proper divisors (1523175).

19801093 is a wasteful number, since it uses less digits than its factorization.

19801093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523174.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 19801093 is about 4449.8419073041. The cubic root of 19801093 is about 270.5389008143.

The spelling of 19801093 in words is "nineteen million, eight hundred one thousand, ninety-three".