19699901 has 4 divisors (see below), whose sum is σ = 21215292. Its totient is φ = 18184512.

The previous prime is 19699879. The next prime is 19699951. The reversal of 19699901 is 10999691.

It is a happy number.

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 13579225 + 6120676 = 3685^2 + 2474^2 .

It is a cyclic number.

It is not a de Polignac number, because 19699901 - 2¹⁸ = 19437757 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 (19699951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757676 + ... + 757701.

It is an arithmetic number, because the mean of its divisors is an integer number (5303823).

Almost surely, 2^19699901 is an apocalyptic number.

It is an amenable number.

19699901 is a deficient number, since it is larger than the sum of its proper divisors (1515391).

19699901 is a wasteful number, since it uses less digits than its factorization.

19699901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515390.

The product of its (nonzero) digits is 39366, while the sum is 44.

The square root of 19699901 is about 4438.4570517242. The cubic root of 19699901 is about 270.0772572698.

The spelling of 19699901 in words is "nineteen million, six hundred ninety-nine thousand, nine hundred one".