19045561 has 2 divisors, whose sum is σ = 19045562. Its totient is φ = 19045560.

The previous prime is 19045553. The next prime is 19045571. The reversal of 19045561 is 16554091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 383161 = 4320^2 + 619^2 .

It is an emirp because it is prime and its reverse (16554091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19045561 - 2³ = 19045553 is a prime.

It is not a weakly prime, because it can be changed into another prime (19045511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9522780 + 9522781.

It is an arithmetic number, because the mean of its divisors is an integer number (9522781).

Almost surely, 2^19045561 is an apocalyptic number.

It is an amenable number.

19045561 is a deficient number, since it is larger than the sum of its proper divisors (1).

19045561 is an equidigital number, since it uses as much as digits as its factorization.

19045561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 19045561 is about 4364.1220193757. The cubic root of 19045561 is about 267.0532841703.

The spelling of 19045561 in words is "nineteen million, forty-five thousand, five hundred sixty-one".