42091789951 has 2 divisors, whose sum is σ = 42091789952. Its totient is φ = 42091789950.

The previous prime is 42091789939. The next prime is 42091789967. The reversal of 42091789951 is 15998719024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42091789951 - 2¹³ = 42091781759 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42091789892 and 42091789901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42091781951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21045894975 + 21045894976.

It is an arithmetic number, because the mean of its divisors is an integer number (21045894976).

Almost surely, 2^42091789951 is an apocalyptic number.

42091789951 is a deficient number, since it is larger than the sum of its proper divisors (1).

42091789951 is an equidigital number, since it uses as much as digits as its factorization.

42091789951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The spelling of 42091789951 in words is "forty-two billion, ninety-one million, seven hundred eighty-nine thousand, nine hundred fifty-one".