1912906621 has 2 divisors, whose sum is σ = 1912906622. Its totient is φ = 1912906620.

The previous prime is 1912906609. The next prime is 1912906631. The reversal of 1912906621 is 1266092191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1902180996 + 10725625 = 43614^2 + 3275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1912906621 - 2⁷ = 1912906493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1912906631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956453310 + 956453311.

It is an arithmetic number, because the mean of its divisors is an integer number (956453311).

Almost surely, 2^1912906621 is an apocalyptic number.

It is an amenable number.

1912906621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1912906621 is an equidigital number, since it uses as much as digits as its factorization.

1912906621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1912906621 is about 43736.7879593369. The cubic root of 1912906621 is about 1241.3605040039.

The spelling of 1912906621 in words is "one billion, nine hundred twelve million, nine hundred six thousand, six hundred twenty-one".