1911961823 has 2 divisors, whose sum is σ = 1911961824. Its totient is φ = 1911961822.

The previous prime is 1911961789. The next prime is 1911961861. The reversal of 1911961823 is 3281691191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1911961823 - 2¹² = 1911957727 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1911961873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 955980911 + 955980912.

It is an arithmetic number, because the mean of its divisors is an integer number (955980912).

Almost surely, 2^1911961823 is an apocalyptic number.

1911961823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1911961823 is an equidigital number, since it uses as much as digits as its factorization.

1911961823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 41.

The square root of 1911961823 is about 43725.9856721378. The cubic root of 1911961823 is about 1241.1560981271.

The spelling of 1911961823 in words is "one billion, nine hundred eleven million, nine hundred sixty-one thousand, eight hundred twenty-three".