1042642891 has 2 divisors, whose sum is σ = 1042642892. Its totient is φ = 1042642890.

The previous prime is 1042642883. The next prime is 1042643053. The reversal of 1042642891 is 1982462401.

It is a weak prime.

It is an emirp because it is prime and its reverse (1982462401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1042642891 - 2³ = 1042642883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1042642891.

It is not a weakly prime, because it can be changed into another prime (1042640891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521321445 + 521321446.

It is an arithmetic number, because the mean of its divisors is an integer number (521321446).

Almost surely, 2^1042642891 is an apocalyptic number.

1042642891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042642891 is an equidigital number, since it uses as much as digits as its factorization.

1042642891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 1042642891 is about 32289.9812790283. The cubic root of 1042642891 is about 1014.0169053795.

The spelling of 1042642891 in words is "one billion, forty-two million, six hundred forty-two thousand, eight hundred ninety-one".