1912644161 has 2 divisors, whose sum is σ = 1912644162. Its totient is φ = 1912644160.

The previous prime is 1912644133. The next prime is 1912644191. The reversal of 1912644161 is 1614462191.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1893990400 + 18653761 = 43520^2 + 4319^2 .

It is a cyclic number.

It is not a de Polignac number, because 1912644161 - 2¹⁰ = 1912643137 is a prime.

It is not a weakly prime, because it can be changed into another prime (1912644121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956322080 + 956322081.

It is an arithmetic number, because the mean of its divisors is an integer number (956322081).

Almost surely, 2^1912644161 is an apocalyptic number.

It is an amenable number.

1912644161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1912644161 is an equidigital number, since it uses as much as digits as its factorization.

1912644161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 1912644161 is about 43733.7874074496. The cubic root of 1912644161 is about 1241.3037278608.

The spelling of 1912644161 in words is "one billion, nine hundred twelve million, six hundred forty-four thousand, one hundred sixty-one".