1961719743 has 32 divisors (see below), whose sum is σ = 2852321472. Its totient is φ = 1194393600.

The previous prime is 1961719741. The next prime is 1961719757. The reversal of 1961719743 is 3479171691.

It is not a de Polignac number, because 1961719743 - 2¹ = 1961719741 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1961719692 and 1961719701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961719741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 401133 + ... + 405993.

It is an arithmetic number, because the mean of its divisors is an integer number (89135046).

Almost surely, 2^1961719743 is an apocalyptic number.

1961719743 is a deficient number, since it is larger than the sum of its proper divisors (890601729).

1961719743 is a wasteful number, since it uses less digits than its factorization.

1961719743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5115.

The product of its digits is 285768, while the sum is 48.

The square root of 1961719743 is about 44291.3055011929. The cubic root of 1961719743 is about 1251.8308622189.

The spelling of 1961719743 in words is "one billion, nine hundred sixty-one million, seven hundred nineteen thousand, seven hundred forty-three".