1896487561 has 8 divisors (see below), whose sum is σ = 1918839240. Its totient is φ = 1874159232.

The previous prime is 1896487531. The next prime is 1896487591. The reversal of 1896487561 is 1657846981.

It is an interprime number because it is at equal distance from previous prime (1896487531) and next prime (1896487591).

It can be written as a sum of positive squares in 4 ways, for example, as 34047225 + 1862440336 = 5835^2 + 43156^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1896487561 - 2⁵ = 1896487529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1896487531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199431 + ... + 208723.

It is an arithmetic number, because the mean of its divisors is an integer number (239854905).

Almost surely, 2^1896487561 is an apocalyptic number.

It is an amenable number.

1896487561 is a deficient number, since it is larger than the sum of its proper divisors (22351679).

1896487561 is an equidigital number, since it uses as much as digits as its factorization.

1896487561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11675.

The product of its digits is 2903040, while the sum is 55.

The square root of 1896487561 is about 43548.6803588811. The cubic root of 1896487561 is about 1237.7986352155.

The spelling of 1896487561 in words is "one billion, eight hundred ninety-six million, four hundred eighty-seven thousand, five hundred sixty-one".