981355663 has 2 divisors, whose sum is σ = 981355664. Its totient is φ = 981355662.

The previous prime is 981355657. The next prime is 981355709. The reversal of 981355663 is 366553189.

It is an a-pointer prime, because the next prime (981355709) can be obtained adding 981355663 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981355663 - 2¹⁷ = 981224591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981355163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490677831 + 490677832.

It is an arithmetic number, because the mean of its divisors is an integer number (490677832).

Almost surely, 2^981355663 is an apocalyptic number.

981355663 is a deficient number, since it is larger than the sum of its proper divisors (1).

981355663 is an equidigital number, since it uses as much as digits as its factorization.

981355663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 46.

The square root of 981355663 is about 31326.5967350429. The cubic root of 981355663 is about 993.7461924198.

The spelling of 981355663 in words is "nine hundred eighty-one million, three hundred fifty-five thousand, six hundred sixty-three".