42139802891 has 2 divisors, whose sum is σ = 42139802892. Its totient is φ = 42139802890.

The previous prime is 42139802813. The next prime is 42139802909. The reversal of 42139802891 is 19820893124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42139802891 is a prime.

It is not a weakly prime, because it can be changed into another prime (42139802801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21069901445 + 21069901446.

It is an arithmetic number, because the mean of its divisors is an integer number (21069901446).

Almost surely, 2^42139802891 is an apocalyptic number.

42139802891 is a deficient number, since it is larger than the sum of its proper divisors (1).

42139802891 is an equidigital number, since it uses as much as digits as its factorization.

42139802891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 42139802891 in words is "forty-two billion, one hundred thirty-nine million, eight hundred two thousand, eight hundred ninety-one".