19530681 has 4 divisors (see below), whose sum is σ = 26040912. Its totient is φ = 13020452.

The previous prime is 19530661. The next prime is 19530683. The reversal of 19530681 is 18603591.

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 19530681 - 2⁵ = 19530649 is a prime.

It is a super-2 number, since 2×19530681² = 762895000647522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19530683) 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, 3255111 + ... + 3255116.

It is an arithmetic number, because the mean of its divisors is an integer number (6510228).

Almost surely, 2^19530681 is an apocalyptic number.

It is an amenable number.

19530681 is a deficient number, since it is larger than the sum of its proper divisors (6510231).

19530681 is an equidigital number, since it uses as much as digits as its factorization.

19530681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6510230.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 19530681 is about 4419.3530069457. The cubic root of 19530681 is about 269.3017210321.

It can be divided in two parts, 195 and 30681, that added together give a triangular number (30876 = T₂₄₈).

The spelling of 19530681 in words is "nineteen million, five hundred thirty thousand, six hundred eighty-one".