19550001 has 4 divisors (see below), whose sum is σ = 26066672. Its totient is φ = 13033332.

The previous prime is 19549967. The next prime is 19550009. The reversal of 19550001 is 10005591.

It is a happy number.

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 not a de Polignac number, because 19550001 - 2²³ = 11161393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19550001.

It is not an unprimeable number, because it can be changed into a prime (19550009) 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, 3258331 + ... + 3258336.

It is an arithmetic number, because the mean of its divisors is an integer number (6516668).

Almost surely, 2^19550001 is an apocalyptic number.

It is an amenable number.

19550001 is a deficient number, since it is larger than the sum of its proper divisors (6516671).

19550001 is an equidigital number, since it uses as much as digits as its factorization.

19550001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6516670.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 19550001 is about 4421.5383069696. The cubic root of 19550001 is about 269.3904906727.

Adding to 19550001 its reverse (10005591), we get a palindrome (29555592).

The spelling of 19550001 in words is "nineteen million, five hundred fifty thousand, one".