1961693879 has 2 divisors, whose sum is σ = 1961693880. Its totient is φ = 1961693878.

The previous prime is 1961693843. The next prime is 1961693917. The reversal of 1961693879 is 9783961691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1961693879 - 2²⁰ = 1960645303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961692879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980846939 + 980846940.

It is an arithmetic number, because the mean of its divisors is an integer number (980846940).

Almost surely, 2^1961693879 is an apocalyptic number.

1961693879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961693879 is an equidigital number, since it uses as much as digits as its factorization.

1961693879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 59.

The square root of 1961693879 is about 44291.0135241902. The cubic root of 1961693879 is about 1251.8253606692.

The spelling of 1961693879 in words is "one billion, nine hundred sixty-one million, six hundred ninety-three thousand, eight hundred seventy-nine".