1961022689 has 4 divisors (see below), whose sum is σ = 2002746624. Its totient is φ = 1919298756.

The previous prime is 1961022677. The next prime is 1961022691. The reversal of 1961022689 is 9862201691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1961022689 - 2⁴ = 1961022673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961022649) 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, 20861897 + ... + 20861990.

It is an arithmetic number, because the mean of its divisors is an integer number (500686656).

Almost surely, 2^1961022689 is an apocalyptic number.

It is an amenable number.

1961022689 is a deficient number, since it is larger than the sum of its proper divisors (41723935).

1961022689 is an equidigital number, since it uses as much as digits as its factorization.

1961022689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41723934.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 1961022689 is about 44283.4358310193. The cubic root of 1961022689 is about 1251.6825744583.

The spelling of 1961022689 in words is "one billion, nine hundred sixty-one million, twenty-two thousand, six hundred eighty-nine".