1961321283 has 24 divisors (see below), whose sum is σ = 2944642960. Its totient is φ = 1306166796.

The previous prime is 1961321267. The next prime is 1961321293. The reversal of 1961321283 is 3821231691.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

1961321283 is a `hidden beast` number, since 19 + 613 + 2 + 1 + 28 + 3 = 666.

It is not a de Polignac number, because 1961321283 - 2⁴ = 1961321267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961321293) 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 23 ways as a sum of consecutive naturals, for example, 2070616 + ... + 2071562.

Almost surely, 2^1961321283 is an apocalyptic number.

1961321283 is a deficient number, since it is larger than the sum of its proper divisors (983321677).

1961321283 is an frugal number, since it uses more digits than its factorization.

1961321283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915 (or 950 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 1961321283 is about 44286.8070987286. The cubic root of 1961321283 is about 1251.7461001451.

Multiplying 1961321283 by its product of digits (15552), we get a square (30502468593216 = 5522904²).

The spelling of 1961321283 in words is "one billion, nine hundred sixty-one million, three hundred twenty-one thousand, two hundred eighty-three".