1961082391 has 2 divisors, whose sum is σ = 1961082392. Its totient is φ = 1961082390.

The previous prime is 1961082349. The next prime is 1961082433. The reversal of 1961082391 is 1932801691.

It is a balanced prime because it is at equal distance from previous prime (1961082349) and next prime (1961082433).

It is an emirp because it is prime and its reverse (1932801691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1961082391 - 2⁹ = 1961081879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961082301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980541195 + 980541196.

It is an arithmetic number, because the mean of its divisors is an integer number (980541196).

Almost surely, 2^1961082391 is an apocalyptic number.

1961082391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961082391 is an equidigital number, since it uses as much as digits as its factorization.

1961082391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 1961082391 is about 44284.1099154087. The cubic root of 1961082391 is about 1251.6952765372.

The spelling of 1961082391 in words is "one billion, nine hundred sixty-one million, eighty-two thousand, three hundred ninety-one".