1961694443 has 4 divisors (see below), whose sum is σ = 2007315288. Its totient is φ = 1916073600.

The previous prime is 1961694421. The next prime is 1961694457. The reversal of 1961694443 is 3444961691.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1961694443 - 2¹² = 1961690347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961694143) 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, 22810358 + ... + 22810443.

It is an arithmetic number, because the mean of its divisors is an integer number (501828822).

Almost surely, 2^1961694443 is an apocalyptic number.

1961694443 is a deficient number, since it is larger than the sum of its proper divisors (45620845).

1961694443 is an equidigital number, since it uses as much as digits as its factorization.

1961694443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45620844.

The product of its digits is 559872, while the sum is 47.

The square root of 1961694443 is about 44291.0198911698. The cubic root of 1961694443 is about 1251.8254806386.

The spelling of 1961694443 in words is "one billion, nine hundred sixty-one million, six hundred ninety-four thousand, four hundred forty-three".