19691001 has 12 divisors (see below), whose sum is σ = 31028400. Its totient is φ = 11933880.

The previous prime is 19690997. The next prime is 19691017. The reversal of 19691001 is 10019691.

It is not a de Polignac number, because 19691001 - 2² = 19690997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19691051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99351 + ... + 99548.

It is an arithmetic number, because the mean of its divisors is an integer number (2585700).

Almost surely, 2^19691001 is an apocalyptic number.

19691001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19691001 is a deficient number, since it is larger than the sum of its proper divisors (11337399).

19691001 is a wasteful number, since it uses less digits than its factorization.

19691001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198916 (or 198913 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 19691001 is about 4437.4543377932. The cubic root of 19691001 is about 270.0365794062.

The spelling of 19691001 in words is "nineteen million, six hundred ninety-one thousand, one".