997787671 has 2 divisors, whose sum is σ = 997787672. Its totient is φ = 997787670.

The previous prime is 997787663. The next prime is 997787689. The reversal of 997787671 is 176787799.

997787671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997787671 - 2³ = 997787663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997787971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498893835 + 498893836.

It is an arithmetic number, because the mean of its divisors is an integer number (498893836).

Almost surely, 2^997787671 is an apocalyptic number.

997787671 is a deficient number, since it is larger than the sum of its proper divisors (1).

997787671 is an equidigital number, since it uses as much as digits as its factorization.

997787671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9335088, while the sum is 61.

The square root of 997787671 is about 31587.7772405720. Note that the first 3 decimals coincide. The cubic root of 997787671 is about 999.2620125084.

The spelling of 997787671 in words is "nine hundred ninety-seven million, seven hundred eighty-seven thousand, six hundred seventy-one".