1926556561 has 2 divisors, whose sum is σ = 1926556562. Its totient is φ = 1926556560.

The previous prime is 1926556537. The next prime is 1926556601. The reversal of 1926556561 is 1656556291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1748494225 + 178062336 = 41815^2 + 13344^2 .

It is a cyclic number.

It is not a de Polignac number, because 1926556561 - 2²¹ = 1924459409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1926556531) 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, 963278280 + 963278281.

It is an arithmetic number, because the mean of its divisors is an integer number (963278281).

Almost surely, 2^1926556561 is an apocalyptic number.

It is an amenable number.

1926556561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1926556561 is an equidigital number, since it uses as much as digits as its factorization.

1926556561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 46.

The square root of 1926556561 is about 43892.5570114114. The cubic root of 1926556561 is about 1244.3061699660.

The spelling of 1926556561 in words is "one billion, nine hundred twenty-six million, five hundred fifty-six thousand, five hundred sixty-one".