1642120411 has 2 divisors, whose sum is σ = 1642120412. Its totient is φ = 1642120410.

The previous prime is 1642120409. The next prime is 1642120433. The reversal of 1642120411 is 1140212461.

It is an a-pointer prime, because the next prime (1642120433) can be obtained adding 1642120411 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1642120411 - 2¹ = 1642120409 is a prime.

Together with 1642120409, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1642120211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821060205 + 821060206.

It is an arithmetic number, because the mean of its divisors is an integer number (821060206).

Almost surely, 2^1642120411 is an apocalyptic number.

1642120411 is the 21661-st centered heptagonal number.

1642120411 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642120411 is an equidigital number, since it uses as much as digits as its factorization.

1642120411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1642120411 is about 40523.0849146508. The cubic root of 1642120411 is about 1179.7817299527.

Adding to 1642120411 its reverse (1140212461), we get a palindrome (2782332872).

The spelling of 1642120411 in words is "one billion, six hundred forty-two million, one hundred twenty thousand, four hundred eleven".