997886887 has 2 divisors, whose sum is σ = 997886888. Its totient is φ = 997886886.

The previous prime is 997886849. The next prime is 997886899. The reversal of 997886887 is 788688799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997886887 - 2⁷ = 997886759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997887887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498943443 + 498943444.

It is an arithmetic number, because the mean of its divisors is an integer number (498943444).

Almost surely, 2^997886887 is an apocalyptic number.

997886887 is a deficient number, since it is larger than the sum of its proper divisors (1).

997886887 is an equidigital number, since it uses as much as digits as its factorization.

997886887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97542144, while the sum is 70.

The square root of 997886887 is about 31589.3476824071. The cubic root of 997886887 is about 999.2951322782.

The spelling of 997886887 in words is "nine hundred ninety-seven million, eight hundred eighty-six thousand, eight hundred eighty-seven".