19664131 has 8 divisors (see below), whose sum is σ = 20407520. Its totient is φ = 18931968.

The previous prime is 19664123. The next prime is 19664159. The reversal of 19664131 is 13146691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19664131 - 2³ = 19664123 is a prime.

It is a super-2 number, since 2×19664131² = 773356095970322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19664093 and 19664102.

It is not an unprimeable number, because it can be changed into a prime (19664101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 850 + ... + 6328.

It is an arithmetic number, because the mean of its divisors is an integer number (2550940).

Almost surely, 2^19664131 is an apocalyptic number.

19664131 is a deficient number, since it is larger than the sum of its proper divisors (743389).

19664131 is an equidigital number, since it uses as much as digits as its factorization.

19664131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5613.

The product of its digits is 3888, while the sum is 31.

The square root of 19664131 is about 4434.4256674343. The cubic root of 19664131 is about 269.9136944089.

The spelling of 19664131 in words is "nineteen million, six hundred sixty-four thousand, one hundred thirty-one".