19142561 has 4 divisors (see below), whose sum is σ = 20268612. Its totient is φ = 18016512.

The previous prime is 19142551. The next prime is 19142567. The reversal of 19142561 is 16524191.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15062161 + 4080400 = 3881^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 19142561 - 2²² = 14948257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19142567) 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, 563000 + ... + 563033.

It is an arithmetic number, because the mean of its divisors is an integer number (5067153).

Almost surely, 2^19142561 is an apocalyptic number.

It is an amenable number.

19142561 is a deficient number, since it is larger than the sum of its proper divisors (1126051).

19142561 is a wasteful number, since it uses less digits than its factorization.

19142561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126050.

The product of its digits is 2160, while the sum is 29.

The square root of 19142561 is about 4375.2212515483. The cubic root of 19142561 is about 267.5058885943.

The spelling of 19142561 in words is "nineteen million, one hundred forty-two thousand, five hundred sixty-one".