19970105 has 4 divisors (see below), whose sum is σ = 23964132. Its totient is φ = 15976080.

The previous prime is 19970081. The next prime is 19970117. The reversal of 19970105 is 50107991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50107991 = 151 ⋅331841.

It can be written as a sum of positive squares in 2 ways, for example, as 10582009 + 9388096 = 3253^2 + 3064^2 .

It is a de Polignac number, because none of the positive numbers 2^k-19970105 is a prime.

It is a super-2 number, since 2×19970105² = 797610187422050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1997006 + ... + 1997015.

It is an arithmetic number, because the mean of its divisors is an integer number (5991033).

Almost surely, 2^19970105 is an apocalyptic number.

It is an amenable number.

19970105 is a deficient number, since it is larger than the sum of its proper divisors (3994027).

19970105 is an equidigital number, since it uses as much as digits as its factorization.

19970105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994026.

The product of its (nonzero) digits is 2835, while the sum is 32.

The square root of 19970105 is about 4468.7923424567. The cubic root of 19970105 is about 271.3064483595.

The spelling of 19970105 in words is "nineteen million, nine hundred seventy thousand, one hundred five".