1642841693 has 2 divisors, whose sum is σ = 1642841694. Its totient is φ = 1642841692.

The previous prime is 1642841671. The next prime is 1642841701. The reversal of 1642841693 is 3961482461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1641627289 + 1214404 = 40517^2 + 1102^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642841693 - 2⁸ = 1642841437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642841633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821420846 + 821420847.

It is an arithmetic number, because the mean of its divisors is an integer number (821420847).

Almost surely, 2^1642841693 is an apocalyptic number.

It is an amenable number.

1642841693 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642841693 is an equidigital number, since it uses as much as digits as its factorization.

1642841693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 44.

The square root of 1642841693 is about 40531.9835808710. The cubic root of 1642841693 is about 1179.9544397328.

The spelling of 1642841693 in words is "one billion, six hundred forty-two million, eight hundred forty-one thousand, six hundred ninety-three".