842981551 has 2 divisors, whose sum is σ = 842981552. Its totient is φ = 842981550.

The previous prime is 842981549. The next prime is 842981593. The reversal of 842981551 is 155189248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 842981551 - 2¹ = 842981549 is a prime.

Together with 842981549, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 842981498 and 842981507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (842981521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421490775 + 421490776.

It is an arithmetic number, because the mean of its divisors is an integer number (421490776).

Almost surely, 2^842981551 is an apocalyptic number.

842981551 is a deficient number, since it is larger than the sum of its proper divisors (1).

842981551 is an equidigital number, since it uses as much as digits as its factorization.

842981551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115200, while the sum is 43.

The square root of 842981551 is about 29034.1445715213. The cubic root of 842981551 is about 944.6538306372.

It can be divided in two parts, 84298 and 1551, that added together give a square (85849 = 293²).

The spelling of 842981551 in words is "eight hundred forty-two million, nine hundred eighty-one thousand, five hundred fifty-one".