1858842641 has 2 divisors, whose sum is σ = 1858842642. Its totient is φ = 1858842640.

The previous prime is 1858842617. The next prime is 1858842647. The reversal of 1858842641 is 1462488581.

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., 1758041041 + 100801600 = 41929^2 + 10040^2 .

It is a cyclic number.

It is not a de Polignac number, because 1858842641 - 2¹⁰ = 1858841617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1858842647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 929421320 + 929421321.

It is an arithmetic number, because the mean of its divisors is an integer number (929421321).

Almost surely, 2^1858842641 is an apocalyptic number.

It is an amenable number.

1858842641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1858842641 is an equidigital number, since it uses as much as digits as its factorization.

1858842641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 491520, while the sum is 47.

The square root of 1858842641 is about 43114.2974081684. The cubic root of 1858842641 is about 1229.5538163977.

The spelling of 1858842641 in words is "one billion, eight hundred fifty-eight million, eight hundred forty-two thousand, six hundred forty-one".