19500001 has 4 divisors (see below), whose sum is σ = 19682352. Its totient is φ = 19317652.

The previous prime is 19499983. The next prime is 19500017. The reversal of 19500001 is 10000591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19500001 - 2⁷ = 19499873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19500101) 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, 91015 + ... + 91228.

It is an arithmetic number, because the mean of its divisors is an integer number (4920588).

Almost surely, 2^19500001 is an apocalyptic number.

It is an amenable number.

19500001 is a deficient number, since it is larger than the sum of its proper divisors (182351).

19500001 is a wasteful number, since it uses less digits than its factorization.

19500001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182350.

The product of its (nonzero) digits is 45, while the sum is 16.

The square root of 19500001 is about 4415.8805463916. The cubic root of 19500001 is about 269.1606352054.

Adding to 19500001 its reverse (10000591), we get a palindrome (29500592).

The spelling of 19500001 in words is "nineteen million, five hundred thousand, one".