981795557 has 2 divisors, whose sum is σ = 981795558. Its totient is φ = 981795556.

The previous prime is 981795541. The next prime is 981795559. The reversal of 981795557 is 755597189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 786746401 + 195049156 = 28049^2 + 13966^2 .

It is a cyclic number.

It is not a de Polignac number, because 981795557 - 2⁴ = 981795541 is a prime.

Together with 981795559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981795559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490897778 + 490897779.

It is an arithmetic number, because the mean of its divisors is an integer number (490897779).

Almost surely, 2^981795557 is an apocalyptic number.

It is an amenable number.

981795557 is a deficient number, since it is larger than the sum of its proper divisors (1).

981795557 is an equidigital number, since it uses as much as digits as its factorization.

981795557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3969000, while the sum is 56.

The square root of 981795557 is about 31333.6170430418. The cubic root of 981795557 is about 993.8946529300.

The spelling of 981795557 in words is "nine hundred eighty-one million, seven hundred ninety-five thousand, five hundred fifty-seven".