1961009123 has 2 divisors, whose sum is σ = 1961009124. Its totient is φ = 1961009122.

The previous prime is 1961009111. The next prime is 1961009161. The reversal of 1961009123 is 3219001691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1961009123 - 2⁴ = 1961009107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1961009123.

It is not a weakly prime, because it can be changed into another prime (1961009423) 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, 980504561 + 980504562.

It is an arithmetic number, because the mean of its divisors is an integer number (980504562).

Almost surely, 2^1961009123 is an apocalyptic number.

1961009123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961009123 is an equidigital number, since it uses as much as digits as its factorization.

1961009123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1961009123 is about 44283.2826583577. The cubic root of 1961009123 is about 1251.6796881472.

The spelling of 1961009123 in words is "one billion, nine hundred sixty-one million, nine thousand, one hundred twenty-three".