2101782609461 has 2 divisors, whose sum is σ = 2101782609462. Its totient is φ = 2101782609460.

The previous prime is 2101782609379. The next prime is 2101782609469. The reversal of 2101782609461 is 1649062871012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1816311462436 + 285471147025 = 1347706^2 + 534295^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101782609461 - 2¹⁰ = 2101782608437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101782609469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050891304730 + 1050891304731.

It is an arithmetic number, because the mean of its divisors is an integer number (1050891304731).

Almost surely, 2^{2101782609461} is an apocalyptic number.

It is an amenable number.

2101782609461 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101782609461 is an equidigital number, since it uses as much as digits as its factorization.

2101782609461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 2101782609461 in words is "two trillion, one hundred one billion, seven hundred eighty-two million, six hundred nine thousand, four hundred sixty-one".