1842789661 has 2 divisors, whose sum is σ = 1842789662. Its totient is φ = 1842789660.

The previous prime is 1842789623. The next prime is 1842789671. The reversal of 1842789661 is 1669872481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1544018436 + 298771225 = 39294^2 + 17285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1842789661 - 2²⁵ = 1809235229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1842789599 and 1842789608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1842789671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 921394830 + 921394831.

It is an arithmetic number, because the mean of its divisors is an integer number (921394831).

Almost surely, 2^1842789661 is an apocalyptic number.

It is an amenable number.

1842789661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1842789661 is an equidigital number, since it uses as much as digits as its factorization.

1842789661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 52.

The square root of 1842789661 is about 42927.7260171093. The cubic root of 1842789661 is about 1226.0040993576.

The spelling of 1842789661 in words is "one billion, eight hundred forty-two million, seven hundred eighty-nine thousand, six hundred sixty-one".