19055561 has 12 divisors (see below), whose sum is σ = 22316868. Its totient is φ = 16222752.

The previous prime is 19055557. The next prime is 19055587. The reversal of 19055561 is 16555091.

It can be written as a sum of positive squares in 2 ways, for example, as 7529536 + 11526025 = 2744^2 + 3395^2 .

It is not a de Polignac number, because 19055561 - 2² = 19055557 is a prime.

It is a super-2 number, since 2×19055561² = 726228810049442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19055501) 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 11 ways as a sum of consecutive naturals, for example, 6455 + ... + 8931.

It is an arithmetic number, because the mean of its divisors is an integer number (1859739).

Almost surely, 2^19055561 is an apocalyptic number.

It is an amenable number.

19055561 is a deficient number, since it is larger than the sum of its proper divisors (3261307).

19055561 is a wasteful number, since it uses less digits than its factorization.

19055561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2648 (or 2641 counting only the distinct ones).

The product of its (nonzero) digits is 6750, while the sum is 32.

The square root of 19055561 is about 4365.2675748458. The cubic root of 19055561 is about 267.1000153672.

The spelling of 19055561 in words is "nineteen million, fifty-five thousand, five hundred sixty-one".