19964131 has 4 divisors (see below), whose sum is σ = 21779064. Its totient is φ = 18149200.

The previous prime is 19964129. The next prime is 19964149. The reversal of 19964131 is 13146991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19964131 - 2¹ = 19964129 is a prime.

It is a super-2 number, since 2×19964131² = 797133053170322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19964111) 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, 907450 + ... + 907471.

It is an arithmetic number, because the mean of its divisors is an integer number (5444766).

Almost surely, 2^19964131 is an apocalyptic number.

19964131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19964131 is a deficient number, since it is larger than the sum of its proper divisors (1814933).

19964131 is a wasteful number, since it uses less digits than its factorization.

19964131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814932.

The product of its digits is 5832, while the sum is 34.

The square root of 19964131 is about 4468.1238792137. The cubic root of 19964131 is about 271.2793921444.

The spelling of 19964131 in words is "nineteen million, nine hundred sixty-four thousand, one hundred thirty-one".