997671971 has 2 divisors, whose sum is σ = 997671972. Its totient is φ = 997671970.

The previous prime is 997671953. The next prime is 997672003. The reversal of 997671971 is 179176799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997671971 - 2¹⁴ = 997655587 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997671271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498835985 + 498835986.

It is an arithmetic number, because the mean of its divisors is an integer number (498835986).

Almost surely, 2^997671971 is an apocalyptic number.

997671971 is a deficient number, since it is larger than the sum of its proper divisors (1).

997671971 is an equidigital number, since it uses as much as digits as its factorization.

997671971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1500282, while the sum is 56.

The square root of 997671971 is about 31585.9457828953. The cubic root of 997671971 is about 999.2233873623.

The spelling of 997671971 in words is "nine hundred ninety-seven million, six hundred seventy-one thousand, nine hundred seventy-one".