19929101 has 4 divisors (see below), whose sum is σ = 19952604. Its totient is φ = 19905600.

The previous prime is 19929089. The next prime is 19929103. The reversal of 19929101 is 10192991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12773476 + 7155625 = 3574^2 + 2675^2 .

It is a cyclic number.

It is not a de Polignac number, because 19929101 - 2⁶ = 19929037 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 (19929103) 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, 10430 + ... + 12191.

It is an arithmetic number, because the mean of its divisors is an integer number (4988151).

Almost surely, 2^19929101 is an apocalyptic number.

It is an amenable number.

19929101 is a deficient number, since it is larger than the sum of its proper divisors (23503).

19929101 is an equidigital number, since it uses as much as digits as its factorization.

19929101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23502.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 19929101 is about 4464.2021683611. The cubic root of 19929101 is about 271.1206327404.

The spelling of 19929101 in words is "nineteen million, nine hundred twenty-nine thousand, one hundred one".