1912120261 has 2 divisors, whose sum is σ = 1912120262. Its totient is φ = 1912120260.

The previous prime is 1912120247. The next prime is 1912120277. The reversal of 1912120261 is 1620212191.

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., 1591531236 + 320589025 = 39894^2 + 17905^2 .

It is a cyclic number.

It is not a de Polignac number, because 1912120261 - 2⁵ = 1912120229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1912120961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956060130 + 956060131.

It is an arithmetic number, because the mean of its divisors is an integer number (956060131).

Almost surely, 2^1912120261 is an apocalyptic number.

It is an amenable number.

1912120261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1912120261 is an equidigital number, since it uses as much as digits as its factorization.

1912120261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1912120261 is about 43727.7973490548. The cubic root of 1912120261 is about 1241.1903806907.

The spelling of 1912120261 in words is "one billion, nine hundred twelve million, one hundred twenty thousand, two hundred sixty-one".