19513969 has 4 divisors (see below), whose sum is σ = 20541040. Its totient is φ = 18486900.

The previous prime is 19513957. The next prime is 19513987. The reversal of 19513969 is 96931591.

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 a cyclic number.

It is not a de Polignac number, because 19513969 - 2⁵ = 19513937 is a prime.

It is a super-2 number, since 2×19513969² = 761589972265922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19513939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513507 + ... + 513544.

It is an arithmetic number, because the mean of its divisors is an integer number (5135260).

Almost surely, 2^19513969 is an apocalyptic number.

19513969 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19513969 is a deficient number, since it is larger than the sum of its proper divisors (1027071).

19513969 is a wasteful number, since it uses less digits than its factorization.

19513969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027070.

The product of its digits is 65610, while the sum is 43.

The square root of 19513969 is about 4417.4618277921. The cubic root of 19513969 is about 269.2248871410.

The spelling of 19513969 in words is "nineteen million, five hundred thirteen thousand, nine hundred sixty-nine".