2101782609469 has 2 divisors, whose sum is σ = 2101782609470. Its totient is φ = 2101782609468.

The previous prime is 2101782609461. The next prime is 2101782609473. The reversal of 2101782609469 is 9649062871012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1948285556100 + 153497053369 = 1395810^2 + 391787^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101782609469 - 2³ = 2101782609461 is a prime.

It is a super-2 number, since 2×2101782609469² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101782609461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050891304734 + 1050891304735.

It is an arithmetic number, because the mean of its divisors is an integer number (1050891304735).

Almost surely, 2^{2101782609469} is an apocalyptic number.

It is an amenable number.

2101782609469 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101782609469 is an equidigital number, since it uses as much as digits as its factorization.

2101782609469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 2101782609469 in words is "two trillion, one hundred one billion, seven hundred eighty-two million, six hundred nine thousand, four hundred sixty-nine".