1961728533 has 6 divisors (see below), whose sum is σ = 2833607894. Its totient is φ = 1307819016.

The previous prime is 1961728529. The next prime is 1961728597. The reversal of 1961728533 is 3358271691.

1961728533 is a `hidden beast` number, since 1 + 9 + 617 + 28 + 5 + 3 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1300107249 + 661621284 = 36057^2 + 25722^2 .

It is not a de Polignac number, because 1961728533 - 2² = 1961728529 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961728133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108984910 + ... + 108984927.

Almost surely, 2^1961728533 is an apocalyptic number.

It is an amenable number.

1961728533 is a deficient number, since it is larger than the sum of its proper divisors (871879361).

1961728533 is a wasteful number, since it uses less digits than its factorization.

1961728533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217969843 (or 217969840 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 1961728533 is about 44291.4047304892. The cubic root of 1961728533 is about 1251.8327319350.

The spelling of 1961728533 in words is "one billion, nine hundred sixty-one million, seven hundred twenty-eight thousand, five hundred thirty-three".